Fix build breakage on linux where swift version is still 3.0

Author: graydon

test/Parse/ConditionalCompilation/language_version.swift

@@ -49,11 +49,13 @@
 // Check that an extra .0 doesn't make a version "bigger"; NB this test only
 // tests the fix on 3.0.1, but that's the swift version the fix was backported
 // to. On master, the fix is tested by language_version_explicit.swift
+#if swift(>=3.0.1)
 #if swift(>=3.0.1.0)
 #else
   // This shouldn't emit any diagnostics.
   asdf asdf asdf asdf
 #endif
+#endif
 
 #if swift(>=2.0, *) // expected-error {{expected only one argument to platform condition}}
 #endif