Configure checks for chown; add missing shields in code.

Upstream status: not yet presented upstream.

--- readline-7.0/histfile.c.orig	2016-12-06 20:04:10.058901731 +0100
+++ readline-7.0/histfile.c	2016-12-06 20:05:09.220083801 +0100
@@ -610,8 +610,10 @@
      user is running this, it's a no-op.  If the shell is running after sudo
      with a shared history file, we don't want to leave the history file
      owned by root. */
+#if HAVE_CHOWN
   if (rv == 0 && exists)
     r = chown (filename, finfo.st_uid, finfo.st_gid);
+#endif
 
   xfree (filename);
   FREE (tempname);
@@ -757,8 +759,10 @@
      user is running this, it's a no-op.  If the shell is running after sudo
      with a shared history file, we don't want to leave the history file
      owned by root. */
+#if HAVE_CHOWN
   if (rv == 0 && exists)
     mode = chown (histname, finfo.st_uid, finfo.st_gid);
+#endif
 
   FREE (histname);
   FREE (tempname);
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<tr><td><span title='2020-09-29 15:40:25 +0200'>2020-09-29</span></td><td><a href='/guix/commit/po/packages?id=ac324be105977d531928ef7da79483ae7a461b68'>nls: Fix copyright and bug address in pot files.</a><span class='msg-avail'>...</span></td><td>Julien Lepiller</td></tr>
<tr><td><span title='2020-04-14 13:01:58 +0200'>2020-04-14</span></td><td><a href='/guix/commit/po/packages?id=2b2921937017bf4b3c7c8be2d0448f8c64d02bb1'>nls: Update.</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-04-12 00:18:05 +0200'>2020-04-12</span></td><td><a href='/guix/commit/po/packages?id=935ef44b398353b5b6af94e185d7b0c3d833db0b'>nls: Update.</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-03-23 00:06:58 +0100'>2020-03-23</span></td><td><a href='/guix/commit/po/packages?id=86603d8660e42a3b5d8b407e456a98429943bc7e'>nls: Update.</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-05-13 22:44:22 +0200'>2019-05-13</span></td><td><a href='/guix/commit/po/packages?id=d1b18fbb5c119f16d57d08ac4264e10a0a536884'>nls: Update 'fr' translation.</a></td><td>Julien Lepiller</td></tr>
<tr><td><span title='2019-05-03 17:47:30 +0200'>2019-05-03</span></td><td><a href='/guix/commit/po/packages?id=adb5506b2cfb47f696d66a03ede897e9bfa829bb'>nls: Update da translations.</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-05-01 10:49:52 +0200'>2019-05-01</span></td><td><a href='/guix/commit/po/packages?id=20ee8883bcb1d75e8e783de5254e11e7142c1e61'>nls: Update translations for de and fr.</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-04-25 18:55:12 +0200'>2019-04-25</span></td><td><a href='/guix/commit/po/packages?id=57e2b24dc03e44e4e379436e63d29231f1f9d28c'>nls: Update 'es' translation.</a></td><td>Julien Lepiller</td></tr>
<tr><td><span title='2019-04-25 18:54:46 +0200'>2019-04-25</span></td><td><a href='/guix/commit/po/packages?id=518acc73c11d0fc4118bd4f4f9220fe745d59054'>nls: Update 'fr' translation.</a></td><td>Julien Lepiller</td></tr>
<tr><td><span title='2019-04-13 14:50:46 +0200'>2019-04-13</span></td><td><a href='/guix/commit/po/packages?id=a27ed8fd35ce66520bc3d81dbe752841583d1482'>nls: Update 'fr' translation.</a></td><td>Julien Lepiller</td></tr>