By default 'mutt' embeds configure flags and the output of 'gcc -v',
which contains the store file name of Bash and GCC.  This patch makes
sure we don't embed a reference to these in 'mutt'.

--- mutt-1.5.23/txt2c.sh	2015-06-26 22:56:56.500731643 +0200
+++ mutt-1.5.23/txt2c.sh	2015-06-26 22:57:26.664583900 +0200
@@ -21,6 +21,8 @@ txt2c_fallback () {
 	echo ";"
 }
 
+echo "unsigned char $1[] = \"value of '$1' not kept\";"
+exit 0
 ./txt2c test </dev/null >/dev/null 2>&1 &&
 ./txt2c "$1" ||
 txt2c_fallback "$1"

/'>index</a> : <a href='/guix/'>guix</a></td><td class='form'><form method='get'>
<input type='hidden' name='id' value='b8a6230df3fbbeeddb7a0e6976e0b8581bd0ab6e'/><select name='h' onchange='this.form.submit();'>
<option value='koszko' selected='selected'>koszko</option>
<option value='koszko-scripts'>koszko-scripts</option>
</select> <input type='submit' value='switch'/></form></td></tr>
<tr><td class='sub'>Wojtek's customized Guix</td><td class='sub right'></td></tr></table>
<table class='tabs'><tr><td>
<a href='/guix/about/'>about</a><a href='/guix/'>summary</a><a href='/guix/refs/?id=b8a6230df3fbbeeddb7a0e6976e0b8581bd0ab6e'>refs</a><a class='active' href='/guix/log/gnu/packages/gawk.scm'>log</a><a href='/guix/tree/gnu/packages/gawk.scm?id=b8a6230df3fbbeeddb7a0e6976e0b8581bd0ab6e'>tree</a><a href='/guix/commit/gnu/packages/gawk.scm?id=b8a6230df3fbbeeddb7a0e6976e0b8581bd0ab6e'>commit</a><a href='/guix/diff/gnu/packages/gawk.scm?id=b8a6230df3fbbeeddb7a0e6976e0b8581bd0ab6e'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/gnu/packages/gawk.scm'>
<input type='hidden' name='id' value='b8a6230df3fbbeeddb7a0e6976e0b8581bd0ab6e'/><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=b8a6230df3fbbeeddb7a0e6976e0b8581bd0ab6e'>root</a>/<a href='/guix/log/gnu?id=b8a6230df3fbbeeddb7a0e6976e0b8581bd0ab6e'>gnu</a>/<a href='/guix/log/gnu/packages?id=b8a6230df3fbbeeddb7a0e6976e0b8581bd0ab6e'>packages</a>/<a href='/guix/log/gnu/packages/gawk.scm?id=b8a6230df3fbbeeddb7a0e6976e0b8581bd0ab6e'>gawk.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/gawk.scm?id=b8a6230df3fbbeeddb7a0e6976e0b8581bd0ab6e&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2018-03-23 04:41:51 -0400'>2018-03-23</span></td><td><a href='/guix/commit/gnu/packages/gawk.scm?id=dcd5ea699fe4f7e8c1f53933e4d0e027c1a0a512'>gnu: gawk: Return #t from all phases.</a><span class='msg-avail'>...</span></td><td>Mark H Weaver</td></tr>
<tr><td><span title='2018-03-14 19:12:06 +0200'>2018-03-14</span></td><td><a href='/guix/commit/gnu/packages/gawk.scm?id=7c4a0f975b587d0c2718b80ba5c2fa7b8cc8f2ec'>gnu: gawk: Enable parallel tests.</a><span class='msg-avail'>...</span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2018-03-14 19:12:06 +0200'>2018-03-14</span></td><td><a href='/guix/commit/gnu/packages/gawk.scm?id=3ba42b8566704c588f8d76828f960575c6fc0f53'>gnu: gawk: Update to 4.2.1.</a><span class='msg-avail'>...</span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2017-12-10 23:00:42 +0200'>2017-12-10</span></td><td><a href='/guix/commit/gnu/packages/gawk.scm?id=173c6ec8a391dee9d7b38a20370e48a4a05288d0'>Revert "gnu: gawk: Update to 4.2.0."</a><span class='msg-avail'>...</span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2017-12-10 11:21:43 +0200'>2017-12-10</span></td><td><a href='/guix/commit/gnu/packages/gawk.scm?id=78cd051eef9e25a6993478619d2bdb2db60565a6'>gnu: gawk: Update to 4.2.0.</a><span class='msg-avail'>...</span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2017-03-30 22:59:53 +0200'>2017-03-30</span></td><td><a href='/guix/commit/gnu/packages/gawk.scm?id=84157bb8bf2c610584e0836047da4c710f8eaf76'>Merge branch 'master' into core-updates</a><span class='msg-avail'>...</span></td><td>Marius Bakke</td></tr>
<tr><td><span title='2017-03-30 01:30:16 +0200'>2017-03-30</span></td><td><a href='/guix/commit/gnu/packages/gawk.scm?id=6fd52309b8f52c9bb59fccffac53e029ce94b698'>gnu: Use HTTPS for almost all gnu.org HOME-PAGEs.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2017-01-06 17:16:03 -0500'>2017-01-06</span></td><td><a href='/guix/commit/gnu/packages/gawk.scm?id=8ee40f684941764586cc2de4d8f85d961d02ec5f'>Revert "Revert "gnu: gawk: Don't replace 'sh' reference with 'bash'.""</a><span class='msg-avail'>...</span></td><td>Leo Famulari</td></tr>
<tr><td><span title='2017-01-05 11:22:07 -0500'>2017-01-05</span></td><td><a href='/guix/commit/gnu/packages/gawk.scm?id=f537ad0bf3bd3bdb43f752e091cb4a695a4aa077'>Revert "gnu: gawk: Don't replace 'sh' reference with 'bash'."</a><span class='msg-avail'>...</span></td><td>Leo Famulari</td></tr>
<tr><td><span title='2017-01-05 11:06:06 -0500'>2017-01-05</span></td><td><a href='/guix/commit/gnu/packages/gawk.scm?id=5b2834ae790557a760fea4bf2b8c7bac1ea8f23d'>gnu: gawk: Don't replace 'sh' reference with 'bash'.</a><span class='msg-avail'>...</span></td><td>Leo Famulari</td></tr>
<tr><td><span title='2016-09-02 15:39:10 +0200'>2016-09-02</span></td><td><a href='/guix/commit/gnu/packages/gawk.scm?id=3964e358ab65dfd157427560bfb44de8a150068b'>gnu: gawk: Use 'modify-phases'.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2016-09-02 15:39:10 +0200'>2016-09-02</span></td><td><a href='/guix/commit/gnu/packages/gawk.scm?id=e0649ff3c0db17a27999da36cf9bd9fead8df4c7'>gnu: gawk: Update to 4.1.4.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>