clang/test/Driver/mips-mti-linux.c: Remove XFAIL. It shouldn't fail for targeting win32.

I will remove REQUIRES later.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@252972 91177308-0d34-0410-b5e6-96231b3b80d8

test/Driver/mips-mti-linux.c

@@ -5,7 +5,7 @@
 //        Ideally, we'd like to have an --llvm-toolchain option similar to
 //        the --gcc-toolchain one.
 
-// XFAIL: win32, win64
+// REQUIRES: shell
 
 // = Big-endian, mips32r2, hard float
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \