tests,python: Atomic directory creation
* lang/python/tests/Makefile.am: Use MIDIR_P. * tests/gpg/Makefile.am: Ditto. * tests/gpgsm/Makefile.am: Ditto.
Solves race in parallel build when mkdir fails if directory exists.
- Tweaked the ChangeLog
- Signed-off-by: Werner Koch <wk@gnupg.org>