Merging r330927:

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r330927 | sepavloff | 2018-04-26 01:08:25 -0700 (Thu, 26 Apr 2018) | 2 lines

Make test more platform neutral

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git-svn-id: https://llvm.org/svn/llvm-project/cfe/branches/release_60@332650 91177308-0d34-0410-b5e6-96231b3b80d8

test/Driver/config-file4.c

 // RUN: %clang --config %S/Inputs/empty.cfg -Wall -Wextra -Wformat -Wstrict-aliasing -Wshadow -Wpacked -Winline -Wimplicit-function-declaration -c %s -O2 -o /dev/null -v 2>&1 | FileCheck %s -check-prefix PR37196
-// PR37196: Configuration file: {{.*}}/empty.cfg
+// PR37196: Configuration file: {{.*}}empty.cfg