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

Fixes #1236.
diff --git a/Test/baseResults/glsl.entryPointRename.vert.bad.out b/Test/baseResults/glsl.entryPointRename.vert.bad.out
index 942d312..2afceb8 100644
--- a/Test/baseResults/glsl.entryPointRename.vert.bad.out
+++ b/Test/baseResults/glsl.entryPointRename.vert.bad.out
@@ -1,7 +1,7 @@
 glsl.entryPointRename.vert
 ERROR: Source entry point must be "main"
 
-// Module Version 10200
+// Module Version 10000
 // Generated by (magic number): 80003
 // Id's are bound by 20