Fix symbols for functions defined in maths.S
Fix symbols for functions defined in maths.S

On OS X and windows, every function in maths.S would have to be prefixed with and underscore, and when building libcgc if the symbols are not correctly defined, they end up being linked against the system libc. Now libcgc.h defines the exact symbol to be used so the asm does not have to be different from OS to OS.

f0rki/cb-multios,f0rki/cb-multios,f0rki/cb-multios,f0rki/cb-multios,f0rki/cb-multios