[bug#48120] [PATCH]: Teach etc/committer.scm.in some stuff.

[Maxime Devos]

Hi Guix,

I snarfed these from my cc-for-target branch.
Examples of generated commit messages, without any massaging:

<start snip>
gnu: ufoai-data: Use 'cc-for-target' and friends.

* gnu/packages/games.scm (ufoai-data)
[arguments]<#:configure-flags>: Use the C cross-compiler, instead of hardcoding 
"gcc". Use the C++ cross-compiler, instead of hardcoding "g++".

gnu: mlt: Use 'cc-for-target' and friends.

* gnu/packages/video.scm (mlt)
[arguments]<#:make-flags>: Use the C cross-compiler, instead of hardcoding 
"gcc". Use the C++ cross-compiler, instead of hardcoding "g++".

gnu: theorafile: Use the C cross-compiler.

* gnu/packages/video.scm (theorafile)
[arguments]<#:make-flags>: Use the C cross-compiler, instead of hardcoding 
"gcc".
[arguments]<#:phases>{check}: Only run tests when not requested.
<end snip>

etc/comitter.scm.in should probably do some line wrapping as well.

WDYT?

Greetings,
Maxime.

0001-etc-Teach-committer.scm-about-CC-gcc-cc-for-target-a.patch
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0002-etc-Teach-committer.scm-about-checking-tests-in-the-.patch
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0003-etc-committer-Only-claim-to-be-updating-a-package-wh.patch
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0004-etc-committer-Automatically-generate-a-first-line-in.patch
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0005-etc-committer-Support-list-exp-.-in-make-flags.patch
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0006-etc-committer-Explain-changes-in-configure-flags.patch
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