Build only latest pythons.
libffi: Add patches
gdb: Update to 7.8
gdb: Fix URL
mpfr: Update to 3.1.2 patchlevel 10
openssl: Update to 1.0.1h
sqlite: Update to 3.8.5.0
Update README
Fix default config
Merge pull request #363 from Alexpux/develop

Updates.