Make this test be ingored for linux.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@92880 91177308-0d34-0410-b5e6-96231b3b80d8

test/Rewriter/weak_byref_objects.m

@@ -1,4 +1,4 @@
-// RUN: %clang_cc1 -fblocks -fobjc-gc -rewrite-objc %s -o -
+// RUN: %clang_cc1 -fblocks -triple i386-apple-darwin9 -fobjc-gc -rewrite-objc %s -o -
 
 #define nil 0
 int main() {