- crt: Use ANSI C types

- crt: Use ANSI C types
- math.h: Move nonstandard inline using nonstandard function into nonstandard group
- crtdefs.h: Don't disable non-ANSI C definitions for MSVC only -- the behaviour should be the same for all compilers, so always disable them -- fixes various msvc build errors introduced by 42369.

svn path=/trunk/; revision=42418