Fix unittest failures in Windows

Author: bc-lee

clang-tools-extra/include-cleaner/test/tool.cpp

@@ -49,12 +49,15 @@ int x = foo();
 //        RUN: FileCheck --match-full-lines --check-prefix=EDIT2 %s < %t.cpp
 //  EDIT2-NOT: {{^}}#include "foo.h"{{$}}
 
+// This test has commands that rely on shell capabilities that won't execute
+// correctly on Windows e.g. subshell execution
+//   REQUIRES: shell
 //        RUN: mkdir -p $(dirname %t)/out
 //        RUN: cp %s %t.cpp
 //        RUN: echo "[{\"directory\":\"$(dirname %t)/out\",\"file\":\"../$(basename %t).cpp\",\"command\":\":clang++ -I%S/Inputs/ ../$(basename %t).cpp\"}]" > $(dirname %t)/out/compile_commands.json
-//       RUN: pushd $(dirname %t)
-//       RUN: clang-include-cleaner -p out -edit $(basename %t).cpp
-//       RUN: popd
-//       RUN: FileCheck --match-full-lines --check-prefix=EDIT3 %s < %t.cpp
-//     EDIT3: #include "foo.h"
-// EDIT3-NOT: {{^}}#include "foobar.h"{{$}}
+//        RUN: pushd $(dirname %t)
+//        RUN: clang-include-cleaner -p out -edit $(basename %t).cpp
+//        RUN: popd
+//        RUN: FileCheck --match-full-lines --check-prefix=EDIT3 %s < %t.cpp
+//      EDIT3: #include "foo.h"
+//  EDIT3-NOT: {{^}}#include "foobar.h"{{$}}