Fix the failing windows clang unit tests. NFC

Some tests are missing the {{(.exe)?}} suffix on the exectables
which the FileCheck is grepping for. This will ensure, the lit tests
are clean on windows

Differential Revision: http://reviews.llvm.org/D15579

llvm-svn: 255804
diff --git a/clang/test/Driver/mips-mti-linux.c b/clang/test/Driver/mips-mti-linux.c
index 1549dc5..e3560e2 100644
--- a/clang/test/Driver/mips-mti-linux.c
+++ b/clang/test/Driver/mips-mti-linux.c
@@ -4,6 +4,7 @@
 //        it here to test that we are producing the correct paths/flags.
 //        Ideally, we'd like to have an --llvm-toolchain option similar to
 //        the --gcc-toolchain one.
+// REQUIRES: mips-registered-target
 
 // = Big-endian, mips32r2, hard float
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \