Drop Preprocessor/open-failure test, it breaks running the test suite as root,

and I can't figure out how to write it more portably.

llvm-svn: 90705

clang/test/Preprocessor/open-failure.c

@@ -1,11 +0,0 @@
-// RUN: rm -rf %t.dir
-// RUN: mkdir %t.dir
-// RUN: echo 'void f0();' > %t.dir/t.h
-// RUN: chmod 000 %t.dir/t.h
-// RUN: clang-cc -verify -I %t.dir %s
-
-// FIXME: Is there a way to test this on Windows?
-// XFAIL: win32
-
-#include "t.h" // expected-error {{Permission denied}}
-int f0(void);