GL: we don't need two code paths that do effectively the same.

The enum value is exactly the same for both.

src/Magnum/GL/AbstractTexture.cpp

@@ -1280,13 +1280,7 @@ void AbstractTexture::parameterIImplementationDSA(const GLenum parameter, const
 
 void AbstractTexture::setMaxAnisotropyImplementationNoOp(GLfloat) {}
 
-#ifndef MAGNUM_TARGET_GLES
+void AbstractTexture::setMaxAnisotropyImplementationArbOrExt(GLfloat anisotropy) {
-void AbstractTexture::setMaxAnisotropyImplementationArb(GLfloat anisotropy) {
-    (this->*Context::current().state().texture->parameterfImplementation)(GL_TEXTURE_MAX_ANISOTROPY, anisotropy);
-}
-#endif
-
-void AbstractTexture::setMaxAnisotropyImplementationExt(GLfloat anisotropy) {
     (this->*Context::current().state().texture->parameterfImplementation)(
         #ifndef MAGNUM_TARGET_GLES
         GL_TEXTURE_MAX_ANISOTROPY

src/Magnum/GL/AbstractTexture.h

@@ -586,10 +586,7 @@ class MAGNUM_GL_EXPORT AbstractTexture: public AbstractObject {
         #endif
 
         void MAGNUM_GL_LOCAL setMaxAnisotropyImplementationNoOp(GLfloat);
-        #ifndef MAGNUM_TARGET_GLES
+        void MAGNUM_GL_LOCAL setMaxAnisotropyImplementationArbOrExt(GLfloat anisotropy);
-        void MAGNUM_GL_LOCAL setMaxAnisotropyImplementationArb(GLfloat anisotropy);
-        #endif
-        void MAGNUM_GL_LOCAL setMaxAnisotropyImplementationExt(GLfloat anisotropy);
 
         #if !defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
         void MAGNUM_GL_LOCAL getLevelParameterImplementationDefault(GLint level, GLenum parameter, GLint* values);

src/Magnum/GL/Implementation/TextureState.cpp

@@ -432,14 +432,14 @@ TextureState::TextureState(Context& context, Containers::StaticArrayView<Impleme
         extensions[Extensions::ARB::texture_filter_anisotropic::Index] =
                    Extensions::ARB::texture_filter_anisotropic::string();
 
-        setMaxAnisotropyImplementation = &AbstractTexture::setMaxAnisotropyImplementationArb;
+        setMaxAnisotropyImplementation = &AbstractTexture::setMaxAnisotropyImplementationArbOrExt;
     } else
     #endif
     if(context.isExtensionSupported<Extensions::EXT::texture_filter_anisotropic>()) {
         extensions[Extensions::EXT::texture_filter_anisotropic::Index] =
                    Extensions::EXT::texture_filter_anisotropic::string();
 
-        setMaxAnisotropyImplementation = &AbstractTexture::setMaxAnisotropyImplementationExt;
+        setMaxAnisotropyImplementation = &AbstractTexture::setMaxAnisotropyImplementationArbOrExt;
     } else setMaxAnisotropyImplementation = &AbstractTexture::setMaxAnisotropyImplementationNoOp;
 
     #ifndef MAGNUM_TARGET_GLES