Fit the building tools to Plan 9 environment

I've posted some commits for porting git to Plan 9.

This pull request is thing that cut off building scripts from #305 and is re-constructed that.

I expect this don't change any artifacts.

differ from v1
==============

* drop some adapters, printf, cut, expr or tar
* drop using SHELL_PATH instead of sh
* use real name at Signed-off-by signature

Kyohei Kadota (2):
Fit to Plan 9's ANSI/POSIX compatibility layer Use $(LD) instead of $(CC) for linking the object files

 .github/workflows/main.yml |  1 +
 Makefile                   | 15 +++++----
 ci/lib.sh                  |  8 ++++-
 config.mak.in              |  1 +
 config.mak.uname           |  6 ++++
 generate-cmdlist.sh        |  2 +-
 t/chainlint.sed            | 66 +++++++++++++++++++-------------------
 7 files changed, 57 insertions(+), 42 deletions(-)

base-commit: 3a238e539bcdfe3f9eb5010fd218640c1b499f7a
Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-694%2Flufia%2Fcompat-p9-v3
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-694/lufia/compat-p9-v3
Pull-Request: https://github.com/gitgitgadget/git/pull/694

Range-diff vs v2:

1: c850888c25 ! 1: 534378c4e5 Fit to Plan 9's ANSI/POSIX compatibility layer

     @@ generate-cmdlist.sh: command_list () {
       	grep -v '^$' |
       	sort |
       	uniq
     -@@ generate-cmdlist.sh: category_list () {
     - 
     - get_synopsis () {
     - 	sed -n '
     --		/^NAME/,/'"$1"'/H
     -+		/^NAME/,/'"$1"'/h
     - 		${
     - 			x
     - 			s/.*'"$1"' - \(.*\)/N_("\1")/
      
       ## t/chainlint.sed ##
      @@

2: 6f35562965 = 2: 7d33e11867 Use $(LD) instead of $(CC) for linking the object files

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