py-compile: fix optimized compiling for Python 3.5+ Fixes automake bug https://bugs.gnu.org/38043. Split the optimized compilation logic into a new section. This avoids trying to support multiple versions of major versions in a single script as it gets harder to verify new changes don't break old versions as time goes on. Now for Python 3.5+, compile with -O0 (which is "higher" than -O). * NEWS: Mention fix. * THANKS: Add Michal Górny. * lib/py-compile: Add new section for compiling Python 3.5+.