Use a non-recursive replace function when the parser supports it.

https://bugs.gnu.org/29782
https://bugzilla.samba.org/show_bug.cgi?id=9515
https://bugzilla.gnome.org/show_bug.cgi?id=736077 (for xsltproc)

Patch copied from Debian:
https://salsa.debian.org/debian/docbook-xsl/-/blob/master/debian/patches/765567_non-recursive_string_subst.patch

Description: use EXSLT "replace" function when available
 A recursive implementation  of string.subst is problematic,
 long strings with many matches will cause stack overflows.
Author: Peter De Wachter <pdewacht@gmail.com>
Bug-Debian: https://bugs.debian.org/750593

--- a/lib/lib.xsl
+++ b/lib/lib.xsl
@@ -6,7 +6,11 @@
 
      This module implements DTD-independent functions
 
-     ******************************************************************** --><xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">
+     ******************************************************************** -->
+<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
+                xmlns:str="http://exslt.org/strings"
+                exclude-result-prefixes="str"
+                version="1.0">
 
 <xsl:template name="dot.count">
   <!-- Returns the number of "." characters in a string -->
@@ -52,6 +56,9 @@
   <xsl:param name="replacement"/>
 
   <xsl:choose>
+    <xsl:when test="function-available('str:replace')">
+      <xsl:value-of select="str:replace($string, string($target), string($replacement))"/>
+    </xsl:when>
     <xsl:when test="contains($string, $target)">
       <xsl:variable name="rest">
         <xsl:call-template name="string.subst">
96ba4584746'/><select name='qt'>
<option value='grep'>log msg</option>
<option value='author'>author</option>
<option value='committer'>committer</option>
<option value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/guix/log/?id=20b1ef8047ce107c49f9d73bef17096ba4584746'>root</a>/<a href='/guix/log/po?id=20b1ef8047ce107c49f9d73bef17096ba4584746'>po</a>/<a href='/guix/log/po/packages?id=20b1ef8047ce107c49f9d73bef17096ba4584746'>packages</a>/<a href='/guix/log/po/packages/LINGUAS?id=20b1ef8047ce107c49f9d73bef17096ba4584746'>LINGUAS</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/po/packages/LINGUAS?id=20b1ef8047ce107c49f9d73bef17096ba4584746&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2023-01-05 08:14:55 +0100'>2023-01-05</span></td><td><a href='/guix/commit/po/packages/LINGUAS?id=dc7eb6f07ae982b4c9d083cfb10f72cb031c0424'>nls: Update translations.</a><span class='msg-avail'>...<span class='msg-tooltip'>* po/guix/ka.po: New file.
* po/guix/LINGUAS: Add it.
* po/packages/uk.po: New file.
* po/packages/LINGUAS: Add it.
</span></span></td><td>Julien Lepiller</td></tr>
<tr><td><span title='2022-12-04 22:25:23 +0100'>2022-12-04</span></td><td><a href='/guix/commit/po/packages/LINGUAS?id=2e75b328b6bbdadbffe5b643a4891b5026a0defd'>nls: Update translations.</a><span class='msg-avail'>...<span class='msg-tooltip'>po/packages/vi.po: New file.
po/packages/LINGUAS: Add it.
</span></span></td><td>Julien Lepiller</td></tr>
<tr><td><span title='2022-06-04 17:42:54 +0200'>2022-06-04</span></td><td><a href='/guix/commit/po/packages/LINGUAS?id=809c57c872a6dd48007d1abf6d7f3dd1482ec53a'>nls: Update translations.</a><span class='msg-avail'>...<span class='msg-tooltip'>po/packages/tr.po: New file.
po/packages/LINGUAS: Add it.
</span></span></td><td>Julien Lepiller</td></tr>
<tr><td><span title='2022-04-02 18:42:36 +0200'>2022-04-02</span></td><td><a href='/guix/commit/po/packages/LINGUAS?id=8a208df17fe81fbf34f5a86cc52bb0b8e33c7b96'>nls: Update translations.</a><span class='msg-avail'>...<span class='msg-tooltip'>* po/packages/fi.po: New file.
* po/packages/LINGUAS: Add it.
</span></span></td><td>Julien Lepiller</td></tr>
<tr><td><span title='2021-09-02 04:06:52 +0200'>2021-09-02</span></td><td><a href='/guix/commit/po/packages/LINGUAS?id=1ff2092a39dc5c7c7cd9b4a0ba4b59f92e738efc'>nls: Update translations.</a><span class='msg-avail'>...<span class='msg-tooltip'>* po/packages/it.po: New file.
* po/packages/LINGUAS: Add `it'.
* po/*/*.po: Update translations.
</span></span></td><td>Julien Lepiller</td></tr>
<tr><td><span title='2021-05-10 22:27:53 -0400'>2021-05-10</span></td><td><a href='/guix/commit/po/packages/LINGUAS?id=63d26e81eea7be63caeb0eb7ca26ca1cf963ec97'>nls: New nl and oc translations for the 'packages' component.</a><span class='msg-avail'>...<span class='msg-tooltip'>* po/packages/nl.po: New file.
* po/packages/oc.po: Likewise.
* po/packages/LINGUAS: Register them.
</span></span></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2021-04-18 21:07:24 +0200'>2021-04-18</span></td><td><a href='/guix/commit/po/packages/LINGUAS?id=a209c597e2e4e030bbaeb449779b311736026aa1'>nls: Remove 'vi' in LINGUAS</a><span class='msg-avail'>...<span class='msg-tooltip'>The po file is no longer available.

* po/packages/LINGUAS: Remove 'vi'.
</span></span></td><td>Julien Lepiller</td></tr>
<tr><td><span title='2021-04-18 13:18:22 +0200'>2021-04-18</span></td><td><a href='/guix/commit/po/packages/LINGUAS?id=0f355124af123f793bfd3011341d2d539c965884'>nls: Add Korean translation.</a><span class='msg-avail'>...<span class='msg-tooltip'>* po/doc/guix-cookbook.ko.po: New file.
* po/doc/guix-manual.ko.po: New file.
* doc/local.mk (info_TEXINFOS): Add them.
* po/doc/local.mk (DOC_PO_FILES, DOC_COOKBOOK_PO_FILES): Add them.
* po/guix/ko.po: New file.
* po/guix/LINGUAS: Add 'ko'.
* po/packages/ko.po: New file.
* po/packages/LINGUAS: Add 'ko'.
</span></span></td><td>Julien Lepiller</td></tr>
<tr><td><span title='2021-04-18 13:18:17 +0200'>2021-04-18</span></td><td><a href='/guix/commit/po/packages/LINGUAS?id=43fb84da6749a78d12ac0f13db4cecb435de7903'>nls: Add Persian translation.</a><span class='msg-avail'>...<span class='msg-tooltip'>* po/packages/fa.po: New file.
* po/packages/LINGUAS: Add 'fa'.
* po/doc/guix-cookbook.fa.po: New file.
* po/doc/guix-manual.fa.po: New file.
* po/doc/local.mk (DOC_PO_FILES, DOC_COOKBOOK_PO_FILES): Add them.
* doc/local.mk (info_TEXINFOS): Add them.
</span></span></td><td>Julien Lepiller</td></tr>
<tr><td><span title='2021-04-18 13:18:13 +0200'>2021-04-18</span></td><td><a href='/guix/commit/po/packages/LINGUAS?id=77c6c0aa577939da4d35a1ba95ea998459a3f337'>nls: Add Slovak translation.</a><span class='msg-avail'>...<span class='msg-tooltip'>* po/packages/sk.po: New file.
* po/packages/LINGUAS: Add 'sk'.
* po/doc/guix-manual.sk.po: New file.
* doc/local.mk (info_TEXINFOS): Add it.
* po/doc/local.mk (DOC_PO_FILES): Add it.
</span></span></td><td>Julien Lepiller</td></tr>