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"

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<tr><td><span title='2017-09-22 12:21:09 +0200'>2017-09-22</span></td><td><a href='/guix/commit/gnu/packages/avr.scm?id=9fc513ad101c802ad46dd65bc5886b6318abc096'>gnu: Use xxd instead of vim.</a><span class='msg-avail'>...</span></td><td>Ricardo Wurmus</td></tr>
<tr><td><span title='2017-06-20 18:10:35 +0530'>2017-06-20</span></td><td><a href='/guix/commit/gnu/packages/avr.scm?id=148585c240f848ad08f6541ede7db3fca3411007'>gnu: Move contents of zip module into compression module.</a><span class='msg-avail'>...</span></td><td>Arun Isaac</td></tr>
<tr><td><span title='2017-05-24 23:29:35 +0200'>2017-05-24</span></td><td><a href='/guix/commit/gnu/packages/avr.scm?id=6a34e2ae2875e8152f90ad1337832e60b8a85ce1'>gnu: avr-gcc-4.9: Use gcc-4.9 as base compiler.</a><span class='msg-avail'>...</span></td><td>Ricardo Wurmus</td></tr>
<tr><td><span title='2017-05-24 23:29:20 +0200'>2017-05-24</span></td><td><a href='/guix/commit/gnu/packages/avr.scm?id=7b3318e34f4e2743254a88b908859901db960e9a'>gnu: Allow overriding of xgcc package in cross-gcc.</a><span class='msg-avail'>...</span></td><td>Ricardo Wurmus</td></tr>
<tr><td><span title='2016-08-15 14:48:21 -0400'>2016-08-15</span></td><td><a href='/guix/commit/gnu/packages/avr.scm?id=4d2470b0efb399ad974e2a764db685e952b94323'>gnu: avr: Use the correct gcc version as native-input.</a><span class='msg-avail'>...</span></td><td>Danny Milosavljevic</td></tr>
<tr><td><span title='2016-05-31 22:05:44 +0300'>2016-05-31</span></td><td><a href='/guix/commit/gnu/packages/avr.scm?id=2b8ca5fcb4f9d1ee209988ecb1f482a12f1aa57d'>gnu: microscheme: Update to 0.9.3.</a><span class='msg-avail'>...</span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2016-05-30 13:45:21 -0400'>2016-05-30</span></td><td><a href='/guix/commit/gnu/packages/avr.scm?id=9d2bab09aa6e7306ed9eacb74d737b40c221b8f8'>gnu: Add avr-toolchain.</a><span class='msg-avail'>...</span></td><td>David Thompson</td></tr>
<tr><td><span title='2016-05-30 13:45:21 -0400'>2016-05-30</span></td><td><a href='/guix/commit/gnu/packages/avr.scm?id=3087b7077ce6b2125bd0c81d57ea12d4b6b7e956'>gnu: avr-libc: Update to 2.0.0.</a><span class='msg-avail'>...</span></td><td>David Thompson</td></tr>
<tr><td><span title='2016-05-30 13:45:21 -0400'>2016-05-30</span></td><td><a href='/guix/commit/gnu/packages/avr.scm?id=e60972f28847f4a207186754a954dbebe92f207f'>gnu: avr-libc: Fix build.</a><span class='msg-avail'>...</span></td><td>David Thompson</td></tr>
<tr><td><span title='2016-05-30 13:45:21 -0400'>2016-05-30</span></td><td><a href='/guix/commit/gnu/packages/avr.scm?id=a17eea4ba41fc0ab234db618770727da3432be8a'>gnu: Add avr-gcc-5.</a><span class='msg-avail'>...</span></td><td>David Thompson</td></tr>
<tr><td><span title='2016-05-30 13:45:21 -0400'>2016-05-30</span></td><td><a href='/guix/commit/gnu/packages/avr.scm?id=09b05fc7e9bdcdcfd2690777e0cd94c2ecd3afab'>gnu: Add avr-gcc.</a><span class='msg-avail'>...</span></td><td>David Thompson</td></tr>
<tr><td><span title='2016-05-30 13:45:21 -0400'>2016-05-30</span></td><td><a href='/guix/commit/gnu/packages/avr.scm?id=cdc5cfdc4a50c5fda9ec50bfd9477838b8013203'>gnu: Add avr-binutils.</a><span class='msg-avail'>...</span></td><td>David Thompson</td></tr>