Add a triple to test/SemaObjC/format-strings-objc.m to make it pass in windows hosts.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@149696 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/SemaObjC/format-strings-objc.m b/test/SemaObjC/format-strings-objc.m
index 2433000..dd9ff03 100644
--- a/test/SemaObjC/format-strings-objc.m
+++ b/test/SemaObjC/format-strings-objc.m
@@ -1,4 +1,4 @@
-// RUN: %clang_cc1 -Wformat-nonliteral -fsyntax-only -verify %s
+// RUN: %clang_cc1 -triple x86_64-apple-darwin -Wformat-nonliteral -fsyntax-only -verify %s
 
 //===----------------------------------------------------------------------===//
 // The following code is reduced using delta-debugging from