Stop using glTransformFeedbackVaryings and use explicit layout on the shader (#3012)

* Stop using glTransformFeedbackVarying and use explicit layout on the shader

* This is no longer needed

* Shader cache version bump

* Fix gl_PerVertex output for tessellation control shaders

Ryujinx.Graphics.Shader/Translation/TranslationFlags.cs

@@ -9,7 +9,6 @@ namespace Ryujinx.Graphics.Shader.Translation
 
         VertexA   = 1 << 0,
         Compute   = 1 << 1,
-        Feedback  = 1 << 2,
-        DebugMode = 1 << 3
+        DebugMode = 1 << 2
     }
 }