[Gtkradiant] Patch for TODO Textures: add anisotropic filtering

[Enrico Zschemisch]

Hi,

Shaderman schrieb:
> I've created a patch to make anisotropic filtering available (2x/4x/8x/16x)
Are the settings applied after changing them or must I reload/restart 
the program?

> Could someone please test it with Linux and give some feedback?
Compiles and doesn't crash on Debian 32Bit :-D I will try on 64Bit 
Debian later. When changing the filter settings, I see no change on my 
Geforce 6600GT (might be related to my question above or the bad texture 
filter from Nvidia).

Greetings, Enrico