GL: whoops.

Broken since 0ceb54ed7d, but the two code
paths actually differ only by an enum name so it didn't cause any
crashes. (I wonder why I need two different code paths at all.)

src/Magnum/GL/Implementation/TextureState.cpp

@@ -428,7 +428,7 @@ TextureState::TextureState(Context& context, Containers::StaticArrayView<Impleme
 
     /* Anisotropic filter implementation */
     #ifndef MAGNUM_TARGET_GLES
-    if(context.isExtensionSupported<Extensions::EXT::texture_filter_anisotropic>()) {
+    if(context.isExtensionSupported<Extensions::ARB::texture_filter_anisotropic>()) {
         extensions[Extensions::ARB::texture_filter_anisotropic::Index] =
                    Extensions::ARB::texture_filter_anisotropic::string();