Add an extra layer of quoting to ltmain.sh sanity check.

--- a/configure	2005-05-07 14:19:31.000000000 +0200
+++ b/configure	2015-02-10 11:16:32.456146934 +0100
@@ -6266,7 +6266,7 @@
   exit 1
 fi
 gentoo_lt_version="1.5.16"
-gentoo_ltmain_version=`grep '^[:space:]*VERSION=' $ltmain | sed -e 's|^[:space:]*VERSION=||'`
+gentoo_ltmain_version=`grep '^[[:space:]]*VERSION=' $ltmain | sed -e 's|^[[:space:]]*VERSION=||'`
 if test "$gentoo_lt_version" != "$gentoo_ltmain_version"; then
   echo "$as_me:$LINENO: result: no" >&5
 echo "${ECHO_T}no" >&6
--- a/aclocal.m4	2005-05-07 14:19:25.000000000 +0200
+++ b/aclocal.m4	2015-02-10 11:16:15.352030318 +0100
@@ -246,7 +246,7 @@
   exit 1
 fi
 gentoo_lt_version="1.5.16"
-gentoo_ltmain_version=`grep '^[[:space:]]*VERSION=' $ltmain | sed -e 's|^[[:space:]]*VERSION=||'`
+gentoo_ltmain_version=`[grep '^[[:space:]]*VERSION=' $ltmain | sed -e 's|^[[:space:]]*VERSION=||']`
 if test "$gentoo_lt_version" != "$gentoo_ltmain_version"; then
   AC_MSG_RESULT(no)
   echo
--- a/libcpufreq/configure	2005-05-07 14:19:31.000000000 +0200
+++ b/libcpufreq/configure	2015-02-10 11:16:32.456146934 +0100
@@ -6266,7 +6266,7 @@
   exit 1
 fi
 gentoo_lt_version="1.5.16"
-gentoo_ltmain_version=`grep '^[:space:]*VERSION=' $ltmain | sed -e 's|^[:space:]*VERSION=||'`
+gentoo_ltmain_version=`grep '^[[:space:]]*VERSION=' $ltmain | sed -e 's|^[[:space:]]*VERSION=||'`
 if test "$gentoo_lt_version" != "$gentoo_ltmain_version"; then
   echo "$as_me:$LINENO: result: no" >&5
 echo "${ECHO_T}no" >&6
--- a/libcpufreq/aclocal.m4	2005-05-07 14:19:25.000000000 +0200
+++ b/libcpufreq/aclocal.m4	2015-02-10 11:16:15.352030318 +0100
@@ -246,7 +246,7 @@
   exit 1
 fi
 gentoo_lt_version="1.5.16"
-gentoo_ltmain_version=`grep '^[[:space:]]*VERSION=' $ltmain | sed -e 's|^[[:space:]]*VERSION=||'`
+gentoo_ltmain_version=`[grep '^[[:space:]]*VERSION=' $ltmain | sed -e 's|^[[:space:]]*VERSION=||']`
 if test "$gentoo_lt_version" != "$gentoo_ltmain_version"; then
   AC_MSG_RESULT(no)
   echo
guix/log/?id=dac14efe133a7fdcc4301945344aa6eee238e1df'>root</a>/<a href='/guix/log/po?id=dac14efe133a7fdcc4301945344aa6eee238e1df'>po</a>/<a href='/guix/log/po/packages?id=dac14efe133a7fdcc4301945344aa6eee238e1df'>packages</a>/<a href='/guix/log/po/packages/de.po?id=dac14efe133a7fdcc4301945344aa6eee238e1df'>de.po</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/de.po?id=dac14efe133a7fdcc4301945344aa6eee238e1df&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2020-11-12 10:13:45 +0100'>2020-11-12</span></td><td><a href='/guix/commit/po/packages/de.po?id=ef1107e2cca9a5b6f7129d019aabac2f0e89a238'>nls: Update string translations.</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-10-16 15:00:49 +0200'>2020-10-16</span></td><td><a href='/guix/commit/po/packages/de.po?id=a743b04a41b9976a8d087056393ba5cf317af452'>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/de.po?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/de.po?id=86603d8660e42a3b5d8b407e456a98429943bc7e'>nls: Update.</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/de.po?id=20ee8883bcb1d75e8e783de5254e11e7142c1e61'>nls: Update translations for de and fr.</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-02-13 21:40:17 +0100'>2019-02-13</span></td><td><a href='/guix/commit/po/packages/de.po?id=57e508d1c13cc95a37cf44ed429d1d0b97ef763d'>nls: Update 'de' translation.</a></td><td>Julien Lepiller</td></tr>