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

Fixes #1236.
diff --git a/Test/baseResults/hlsl.clipdistance-4.frag.out b/Test/baseResults/hlsl.clipdistance-4.frag.out
index fafde79..d3da568 100644
--- a/Test/baseResults/hlsl.clipdistance-4.frag.out
+++ b/Test/baseResults/hlsl.clipdistance-4.frag.out
@@ -173,7 +173,7 @@
 0:?     'v.Position' ( in 4-component vector of float FragCoord)
 0:?     'v.ClipRect' ( in 4-element array of float ClipDistance)
 
-// Module Version 10200
+// Module Version 10000
 // Generated by (magic number): 80003
 // Id's are bound by 57