SPV Version: Emit the requested SPIR-V version, not the header version.

Fixes #1236.
diff --git a/Test/baseResults/hlsl.clipdistance-1.vert.out b/Test/baseResults/hlsl.clipdistance-1.vert.out
index 26d001b..95eca5e 100644
--- a/Test/baseResults/hlsl.clipdistance-1.vert.out
+++ b/Test/baseResults/hlsl.clipdistance-1.vert.out
@@ -107,7 +107,7 @@
 0:?     'clip' ( out 1-element array of float ClipDistance)
 0:?     'cull' ( out 1-element array of float CullDistance)
 
-// Module Version 10200
+// Module Version 10000
 // Generated by (magic number): 80003
 // Id's are bound by 46