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()