Fix test case for the "empty" linker test case

The test result should only give one error about linking
ES and non-ES shading language compilation units:

 - empty.frag: No version info, interpreted as 100, ES
 - empty2.frag: No version info, interpreted as 100, ES
 - empty3.frag: Version declared as 110, non-ES

Previously, because the new intermediate is always created
without version/profile information, there would be two
linker errors:

 1.) When merging the new intermediate with empty.frag
 2.) When merging (new intermediate + empty.frag + empty2.frag) with empty3.frag

Now, there is only one error; as the error with merging the
new intermediate with empty.frag has been removed.

Test/baseResults/empty.frag.out

@@ -18,8 +18,6 @@ Linked fragment stage:
 
 ERROR: Linking fragment stage: Cannot mix ES profile with non-ES profile shaders
 
-ERROR: Linking fragment stage: Cannot mix ES profile with non-ES profile shaders
-
 ERROR: Linking fragment stage: Missing entry point: Each stage requires one "void main()" entry point
 
 Shader version: 110