gl_state: Remove unused Citra TextureUnits

src/video_core/renderer_opengl/gl_state.h

@@ -11,29 +11,6 @@
 
 namespace OpenGL {
 
-namespace TextureUnits {
-
-struct TextureUnit {
-    GLint id;
-    constexpr GLenum Enum() const {
-        return static_cast<GLenum>(GL_TEXTURE0 + id);
-    }
-};
-
-constexpr TextureUnit MaxwellTexture(int unit) {
-    return TextureUnit{unit};
-}
-
-constexpr TextureUnit LightingLUT{3};
-constexpr TextureUnit FogLUT{4};
-constexpr TextureUnit ProcTexNoiseLUT{5};
-constexpr TextureUnit ProcTexColorMap{6};
-constexpr TextureUnit ProcTexAlphaMap{7};
-constexpr TextureUnit ProcTexLUT{8};
-constexpr TextureUnit ProcTexDiffLUT{9};
-
-} // namespace TextureUnits
-
 class OpenGLState {
 public:
     struct {