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

Fixes #1236.
diff --git a/Test/baseResults/hlsl.entry-out.frag.out b/Test/baseResults/hlsl.entry-out.frag.out
index 11578b0..7d7bb6f 100755
--- a/Test/baseResults/hlsl.entry-out.frag.out
+++ b/Test/baseResults/hlsl.entry-out.frag.out
@@ -243,7 +243,7 @@
 0:?     'out3.v' (layout( location=4) out 2-component vector of float)
 0:?     'out3.i' (layout( location=5) out 2-component vector of int)
 
-// Module Version 10200
+// Module Version 10000
 // Generated by (magic number): 80003
 // Id's are bound by 89