Merge from origin/emacs-28

9c222b9c1a Port to C compilers that lack size-0 arrays
fed35a8951 Port emacsclient to Solaris 10
f35d6a9c73 * CONTRIBUTE: Improve commit message instructions
e0ee1d003a Work around IBM XL C compiler bug
6b99b6eb8b * admin/make-tarball.txt: Various clarifications.
bbf4140091 * admin/diff-tar-files: Don't assume .tar.gz.
0a50ad11db * lisp/tab-bar.el (tab-bar-close-other-tabs): Fix regression.

diff --cc lib-src/Makefile.in
Simple merge

diff --cc lisp/tab-bar.el
Simple merge

diff --cc src/alloc.c
Simple merge

diff --cc src/comp.c
Simple merge

diff --cc src/eval.c
Simple merge

diff --cc src/fileio.c
Simple merge

diff --cc src/lisp.h
Simple merge

diff --cc src/lread.c
Simple merge

diff --cc src/pdumper.c
Simple merge