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'.

diff --git a/txt2c.sh b/txt2c.sh
index f634bb9..53845cf 100755
--- a/txt2c.sh
+++ b/txt2c.sh
@@ -21,6 +21,8 @@ txt2c_fallback () {
 	echo ";"
 }
 
+echo "unsigned char $1[] = \"value of '$1' not kept\";"
+exit 0
 if ./txt2c test </dev/null >/dev/null 2>&1; then
     ./txt2c "$1"
 else
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<tr><td><span title='2023-04-09 12:54:43 +0800'>2023-04-09</span></td><td><a href='/guix/commit/gnu/packages/fcitx5.scm?id=e020c08e626d3c61f4eea422ccf4377a66a3fb2e'>gnu: fcitx5-rime: Update to 5.0.16.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/fcitx5.scm (fcitx5-rime): Update to 5.0.16.
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<tr><td><span title='2023-04-09 12:54:43 +0800'>2023-04-09</span></td><td><a href='/guix/commit/gnu/packages/fcitx5.scm?id=29d05803903292ace0f3e9fe5b184312776cc1fd'>gnu: fcitx5-configtool: Update to 5.0.17.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/fcitx5.scm (fcitx5-configtool): Update to 5.0.17.
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<tr><td><span title='2023-04-09 12:54:43 +0800'>2023-04-09</span></td><td><a href='/guix/commit/gnu/packages/fcitx5.scm?id=96859e1c9b255323bd029f8507a3c059ab2c6b21'>gnu: fcitx5-chinese-addons: Update to 5.0.17.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/fcitx5.scm (fcitx5-chinese-addons): Update to 5.0.17.
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<tr><td><span title='2023-04-09 12:54:43 +0800'>2023-04-09</span></td><td><a href='/guix/commit/gnu/packages/fcitx5.scm?id=18c3727e653a6c47f1f8d624c79bcf086448e52b'>gnu: fcitx5-qt: Update to 5.0.17.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/fcitx5.scm (fcitx5-qt): Update to 5.0.17.
</span></span></td><td>宋文武</td></tr>
<tr><td><span title='2023-04-09 12:54:43 +0800'>2023-04-09</span></td><td><a href='/guix/commit/gnu/packages/fcitx5.scm?id=1b76935e20040e26aa267bc24d3da21bbd44dd9c'>gnu: fcitx5-gtk: Update to 5.0.23.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/fcitx5.scm (fcitx5-gtk): Update to 5.0.23.
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<tr><td><span title='2023-04-09 12:54:43 +0800'>2023-04-09</span></td><td><a href='/guix/commit/gnu/packages/fcitx5.scm?id=d81329763459ebf41a7fe93d23fc441a00968d92'>gnu: libime: Update to 1.0.17.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/fcitx5.scm (libime): Update to 1.0.17.
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<tr><td><span title='2023-04-09 12:54:43 +0800'>2023-04-09</span></td><td><a href='/guix/commit/gnu/packages/fcitx5.scm?id=5d2f8bf1ae8f8e46163a639e7f86073fc08e559b'>gnu: fcitx5: Update to 5.0.23.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/fcitx5.scm (fcitx5): Update to 5.0.23.
</span></span></td><td>宋文武</td></tr>
<tr><td><span title='2023-04-09 12:54:43 +0800'>2023-04-09</span></td><td><a href='/guix/commit/gnu/packages/fcitx5.scm?id=13f7d3e7757fee6b522842bcce04af3d6657713b'>gnu: xcb-imdkit: Update to 1.0.5.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/fcitx5.scm (xcb-imdkit): Update to 1.0.5.
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