gl_FogFragCoord and gl_PointSize are floats rather than vec4s in GLSL,
so they shouldn't have a destination swizzle, and the write mask we
return should consist of only the first component.

wined3d: Split shader_glsl_add_param() in shader_glsl_add_src_param() and shader_glsl_add_dst_param().

Thanks to Rob Shearman for noticing this.

Defined APC_VIRTUAL_ALLOC and APC_VIRTUAL_FREE requests.

Based on a patch by Anatoly Lyutin.