Merge branch 'rs/ban-mktemp'

Rewrite the only use of "mktemp()" that is subject to TOCTOU race
and Stop using the insecure "mktemp()" function.

* rs/ban-mktemp:
  compat: remove gitmkdtemp()
  banned.h: ban mktemp(3)
  compat: remove mingw_mktemp()
  compat: use git_mkdtemp()
  wrapper: add git_mkdtemp()

diff --cc Makefile
Simple merge

diff --cc compat/mingw.c
Simple merge

diff --cc contrib/buildsystems/CMakeLists.txt
Simple merge

diff --cc meson.build
Simple merge

diff --cc wrapper.c
Simple merge