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()

meson.build

@@ -1401,7 +1401,7 @@ checkfuncs = {
   'strlcpy' : ['strlcpy.c'],
   'strtoull' : [],
   'setenv' : ['setenv.c'],
-  'mkdtemp' : ['mkdtemp.c'],
+  'mkdtemp' : [],
   'initgroups' : [],
   'strtoumax' : ['strtoumax.c', 'strtoimax.c'],
   'pread' : ['pread.c'],