clang/test/Driver/linux-header-search.cpp: Add XFAILs, for now. I'll fix them later.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@187192 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Driver/linux-header-search.cpp b/test/Driver/linux-header-search.cpp
index e9ccf62..d4bec1f 100644
--- a/test/Driver/linux-header-search.cpp
+++ b/test/Driver/linux-header-search.cpp
@@ -115,3 +115,6 @@
 // CHECK-DEBIAN-PPC64: "-internal-externc-isystem" "[[SYSROOT]]/usr/include/powerpc64-linux-gnu"
 // CHECK-DEBIAN-PPC64: "-internal-externc-isystem" "[[SYSROOT]]/include"
 // CHECK-DEBIAN-PPC64: "-internal-externc-isystem" "[[SYSROOT]]/usr/include"
+//
+// FIXME: Fix'em later.
+// XFAIL: mingw32,win32