MSVC compiler optimisation hinting, 1% smaller pygame on windows

[MyreMylar]

Related to this issue:
#1403

So far the code I've added to setup.py adds two flags to the extension modules compile process when the system is 'win32' and the compiler supports the two flags. These flags both serve to reduce the size of the generated c code reducing our overall .egg file size by just under 1%.

[lgtm-com]

This pull request introduces 1 alert when merging 4d14f5e into 16a8d3e - view on LGTM.com

new alerts:

• 1 for Module is imported more than once

[MyreMylar]

Also added a PG_FORCEINLINE macro that is the same as PG_INLINE on all compilers except MSC_VER where it means __forceinline. I haven't used it anywhere yet though as Microsoft indicate that using __forceinline may sometimes make performance worse so using it will have to be done on a case by case.

[illume]

👍 Nice.