Desensitize env-include-paths.c to the directory it is running in.

- It would probably be better if TestRunner.sh canonicalized this.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@57075 91177308-0d34-0410-b5e6-96231b3b80d8

test/Driver/env-include-paths.c

@@ -1,6 +1,7 @@
 // RUN: clang -fsyntax-only -verify -DAS_SOURCE %s &&
 // RUN: env CPATH="" clang -fsyntax-only -verify -DAS_SOURCE %s &&
 // RUN: env CPATH="xyz:xyz" clang -fsyntax-only -verify -DAS_SOURCE %s &&
+// RUN: cd $(dirname %s) &&
 // RUN: env CPATH="xyz::xyz" clang -fsyntax-only -verify -DSHOULD_FIND -DAS_SOURCE %s &&
 // RUN: env CPATH="../Driver" clang -fsyntax-only -verify -DSHOULD_FIND -DAS_SOURCE %s