Based on a patch by Aric Stewart.

The header is wrong. There is simply no API to set this. The MS header does
not have this declaration either.

Most of this is "Copyright 2004 Huw Davies for CodeWeavers", I just did a
little bit of integration.

This makes sure the relevant states in FindContext() are actually marked dirty
when needed.

Although WINED3DTEXF_NONE is not a valid minification filter, having it in the
tables simplifies the lookup. GL_NEAREST is more appropriate than GL_LINEAR
though.

There's not really a good reason for them to be visible. The only 
options that are effective are emulation, which pipes through waveout 
and >= basic, which pipes through the accelerated path.

Some systems don't have a gsm.h, so try including gsm/gsm.h first