[benchmark] Fix module-inclusion bug caused by my forgetting about case-insensitive filesystems.

Author: graydon

benchmark/utils/LibProc/LibProc.h

@@ -0,0 +1,15 @@
+//===--- LibProcIncludeSystemHeader.h -------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
+// This file exists to include the following not-yet-modularized system header:
+
+#include <libproc.h>

benchmark/utils/LibProc/LibProcIncludeSystemHeader.h

@@ -11,6 +11,6 @@
 //===----------------------------------------------------------------------===//
 
 module LibProc {
-  header "LibProc.h"
+  header "LibProcIncludeSystemHeader.h"
   export *
 }