SPV: Further refine OpenGL vs. Vulkan differences for SPIR-V.

Includes adding test cases to verify the differences.

Test/baseResults/glspv.version.frag.out

@@ -0,0 +1,24 @@
+glspv.version.frag
+ERROR: #version: compilation for SPIR-V does not support the compatibility profile
+
+
+Linked fragment stage:
+
+
+// Module Version 10000
+// Generated by (magic number): 80001
+// Id's are bound by 6
+
+                              Capability Shader
+               1:             ExtInstImport  "GLSL.std.450"
+                              MemoryModel Logical GLSL450
+                              EntryPoint Fragment 4  "main"
+                              ExecutionMode 4 OriginLowerLeft
+                              Source GLSL 330
+                              Name 4  "main"
+               2:             TypeVoid
+               3:             TypeFunction 2
+         4(main):           2 Function None 3
+               5:             Label
+                              Return
+                              FunctionEnd