Add redeclarations of built-in blocks.

Note: lots of test results changed due to listing the members of a block when printing types.

git-svn-id: https://cvs.khronos.org/svn/repos/ogl/trunk/ecosystem/public/sdk/tools/glslang@23682 e7fa87d3-cd2b-0410-9028-fcbf551c1848

Test/330.frag

@@ -1,4 +1,4 @@
-#version 330
+#version 330 compatibility
 
 in vec4 inVar;
 out vec4 outVar;
@@ -11,3 +11,14 @@ void main()
     gl_FragData[1] = inVar;
     int buffer = 4;
 }
+
+#extension GL_ARB_separate_shader_objects : enable
+
+in gl_PerFragment {
+    vec4 gl_Color;
+};
+
+void foo()
+{
+    vec4 c = gl_Color;
+}