Jonimoose/libfxcg — pull request #23 by gbl08ma (2014-08-31 12:54:50+00:00)
Title: Various header changes

Clean changes from my `diffHeaders` branch (which was not based on the correct master, and thus contained lots of irrelevant changes, when one attempted to submit a pull request).

Adds limits.h and stdint.h.
Adds constants to math.h.
Adds ptrdiff_t to stddef.h.