Disable test on ios

rdar://76004923

Author: aschwaighofer

test/Sema/implementation-only-import-suggestion.swift

@@ -43,3 +43,7 @@ import main // expected-warning{{'implementation-only-import-suggestion.swift' i
 // RUN: not %target-swift-frontend -typecheck %s -library-level ThatsNotALibraryLevel 2>&1 \
 // RUN:   | %FileCheck %s --check-prefix CHECK-ARG
 // CHECK-ARG: error: unknown library level 'ThatsNotALibraryLevel', expected one of 'api', 'spi' or 'other'
+
+
+// rdar://76004923
+// UNSUPPORTED: OS=iphoneos