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
lass='path'>path: <a href='/guix/log/?id=7b7b8c909bdfc3f281d6fd5f40784c46c795c014'>root</a>/<a href='/guix/log/gnu?id=7b7b8c909bdfc3f281d6fd5f40784c46c795c014'>gnu</a>/<a href='/guix/log/gnu/packages?id=7b7b8c909bdfc3f281d6fd5f40784c46c795c014'>packages</a>/<a href='/guix/log/gnu/packages/aidc.scm?id=7b7b8c909bdfc3f281d6fd5f40784c46c795c014'>aidc.scm</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/gnu/packages/aidc.scm?id=7b7b8c909bdfc3f281d6fd5f40784c46c795c014&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2021-06-19 17:38:47 +0200'>2021-06-19</span></td><td><a href='/guix/commit/gnu/packages/aidc.scm?id=6f9a80b331ae41d142a49fbeb94b90ee587b6155'>Merge branch 'master' into core-updates</a><span class='msg-avail'>...<span class='msg-tooltip'>Note: this merge actually changes the 'curl' and 'python-attrs' derivations,
as part of solving caf4a7a2770ef4d05a6e18f40d602e51da749ddc and
12964df69a99de6190422c752fef65ef813f3b6b respectively.

4604d43c0e (gnu: gnutls@3.6.16: Fix cross-compilation.) was ignored because it
cannot currently be tested.

 Conflicts:
	gnu/local.mk
	gnu/packages/aidc.scm
	gnu/packages/boost.scm
	gnu/packages/curl.scm
	gnu/packages/nettle.scm
	gnu/packages/networking.scm
	gnu/packages/python-xyz.scm
	gnu/packages/tls.scm
</span></span></td><td>Marius Bakke</td></tr>
<tr><td><span title='2021-06-14 00:24:42 -0400'>2021-06-14</span></td><td><a href='/guix/commit/gnu/packages/aidc.scm?id=ea0a51071e68c37a4c9c25421cf03bc2f442c67b'>gnu: Rename qtbase to qtbase-5.</a><span class='msg-avail'>...<span class='msg-tooltip'>This change was automated via the following command:

$ git ls-files | xargs sed -i 's/,qtbase)/,qtbase-5)/g'
$ git ls-files | xargs sed -i 's/inherit qtbase)/inherit qtbase-5)/g'
$ git ls-files | xargs sed -i 's/package-version qtbase)/package-version qtbase-5)/g'
$ git checkout etc    # to clear some spurious changes

This is done so the qtbase package can be upgraded to version 6 in the
following commit.
</span></span></td><td>Maxim Cournoyer</td></tr>