Also omit the nameless union macros from the error messages for clarity.

I am not testing SYSTEMMEM and SCRATCH textures. SCRATCH textures
cannot be created, SYSTEMMEM ones cannot be used for texturing on
Windows.

GL_TEXTURE_BASE_LEVEL matches the basetexture::SetLOD functionality.
D3DSAMP_MAXMIPLEVEL essentially does the same as SetLOD. The test included in
this patch shows that the smallest mipmap level is used.

There is no reason to disable linear filtering, we just cannot use mipmapping.

These made sense before we had the quirk table. Nowadys the quirk
table contains quirk description strings that print out whether or not
any apple specific quirks are applied. The traces in match_apple just
spam the log because this code is run multiple times for many quirks.