mesa: remove unused acosf, asinf, atan2f, etc. macros
mesa: remove unused acosf, asinf, atan2f, etc. macros

Not used anywhere.  If any of these are needed, they should be added
to c99_math.h

Reviewed-by: Matt Turner <789b315743a28dd066a4ba1459c35951c291d8a6@gmail.com>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler