GLSL: Error when using location on an arrayed block.

This implements a recent change to the GLSL specification to enforce
this ill-defined situation.

Test/450.tesc

@@ -12,3 +12,12 @@ void main()
 {
     gl_out[gl_InvocationID].gl_CullDistance[2] = gl_in[1].gl_CullDistance[2];
 }
+
+layout(location = 4) out bName1 {
+    float f;
+    layout(location = 5) float g;
+} bInst1[2];
+layout(location = 6) out bName2 {
+    float f;
+    layout(location = 7) float g;  // ERROR, location on array
+} bInst2[2][3];