Issue #19733: Temporary disable test_image on MacOSX.
Issue #19308: fix the gdb plugin on gdbs linked with Python 3
Undo (hopefully) buildbot failures
Fix make distclean for out-of-tree builds
Issue #19743: fix test_gdb on some optimized Python builds
Doc/Makefile: also do "make suspicious" during daily autobuild
Issue #19545: Avoid chained exceptions while passing stray % to
time.strptime().  Initial patch by Claudiu Popa.