fix build, adjust test also for Windows path separator

Introduced in 1e9c1d2b7bfc.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@372263 91177308-0d34-0410-b5e6-96231b3b80d8

test/Frontend/rewrite-includes-conditions.c

@@ -109,5 +109,5 @@ static int unused;
 
 // CHECK: {{^}}// ENDCOMPARE{{$}}
 
-// COMPILE: Inputs/rewrite-includes3.h:1:31: warning: implicit conversion changes signedness:
+// COMPILE: Inputs{{[/\\]}}rewrite-includes3.h:1:31: warning: implicit conversion changes signedness:
 // COMPILE: rewrite-includes-conditions.c:46:12: warning: unused variable 'unused'

test/Frontend/rewrite-includes.c

@@ -250,5 +250,5 @@ static int unused;
 // CHECKNL-NEXT: {{^}}static int unused;{{$}}
 // CHECKNL-NEXT: {{^}}// ENDCOMPARE{{$}}
 
-// COMPILE: Inputs/rewrite-includes3.h:1:31: warning: implicit conversion changes signedness:
+// COMPILE: Inputs{{[/\\]}}rewrite-includes3.h:1:31: warning: implicit conversion changes signedness:
 // COMPILE: rewrite-includes.c:25:12: warning: unused variable 'unused'