ab/make-dependency (was: What's cooking in git.git (Dec 2021, #04; Wed, 15))

> * ab/make-dependency (2021-11-18) 24 commits
>  - Makefile: move ".SUFFIXES" rule to shared.mak
>  - Makefile: define $(LIB_H) in terms of $(FIND_SOURCE_FILES)
>  - Makefile: disable GNU make built-in wildcard rules
>  - Makefile: use $(file) I/O instead of "FORCE" when possible
>  - Makefile: correct the dependency graph of hook-list.h
>  - Makefiles: add and use wildcard "mkdir -p" template
>  - Makefile: use $(wspfx) for $(QUIET...) in shared.mak
>  - Makefile: add "$(QUIET)" boilerplate to shared.mak
>  - Makefile: add a "TRACK_template" for GIT-*{FLAGS,DEFINES,...}
>  - Makefile: re-add and use the "shellquote" macros
>  - Makefile: move $(comma), $(empty) and $(space) to shared.mak
>  - Makefiles: add "shared.mak", move ".DELETE_ON_ERROR" to it
>  - Makefile: stop needing @@GIT_VERSION@@ in *.perl scripts
>  - Makefile: create a GIT-PYTHON-DEFINES, like "PERL"
>  - Makefile: correct "GIT-PERL-{DEFINES,HEADER}" dependency graph
>  - Makefile: adjust Perl-related comments & whitespace
>  - Makefile: change "ifndef NO_PERL" to "ifdef NO_PERL"
>  - Makefile: guard Perl-only variable assignments
>  - Makefile: remove "mv $@ $@+" dance redundant to .DELETE_ON_ERROR
>  - Makefile: clean perl/build/ even with NO_PERL=Y
>  - Makefile: use "=" not ":=" for po/* and perl/*
>  - Makefile: don't set up "perl/build" rules under NO_PERL=Y
>  - Makefile: don't invoke msgfmt with --statistics
>  - Merge branch 'ab/sh-retire-helper-functions' into ab/make-dependency
>
>  Dependency clean-up.
>
>  Needs review.
>  There are some comments on earlier rounds; the latest one needs a
>  serious review or at least Acks from past commentors.
>  source: <patch-v4-23.23-48a3927d972-20211117T101807Z-avarab@gmail.com>