[Python-Dev] (some) C99 added to PEP 7

[Benjamin Peterson]

To conclude our discussion about using C99 features, I've updated PEP 7
to allow the following features:
- Standard integer types in ``<stdint.h>`` and ``<inttypes.h>``
- ``static inline`` functions
- designated initializers
- intermingled declarations
- booleans

I've been adding examples of these to 3.6 over the last few days to make
sure the buildbots will like it.

https://github.com/python/peps/commit/b6efe6e06fa70e8933440da26474a804fb3edb6e

Enjoy.