There's no need to waste constants for repeatedly loading the same value.

This extension is a subset of GL_NV_half_float that defines support
for the stream format(same constant), but doesn't define texture
formats or immediate mode entrypoints.

GL_ARB_shader_texture is supported on dx9 ATI cards(and probably dx10
ones too). For Nvidia cards I included a fallback to normal texld.
GL_EXT_gpu_shader4 supports similar texture*Grad GLSL functions, just
with an EXT prefix instead of ARB. For dx9 NV cards we'd have to use
GL_NV_fragment_program2, which supports a texldd equivalent on those
cards.

In SM 1-3 this is just the version, in SM4 this also includes the token count.

kernel32: Make SystemTimeToTzSpecificLocalTime and TzSpecificLocalTimeToSystemTime prototypes match PSDK.