Clean up a few references to System/. We still have docs/SystemLibrary.html
lying around...

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@141703 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Support/IncludeFile.cpp b/lib/Support/IncludeFile.cpp
index 5da8826..e67acb3 100644
--- a/lib/Support/IncludeFile.cpp
+++ b/lib/Support/IncludeFile.cpp
@@ -1,4 +1,4 @@
-//===- lib/System/IncludeFile.cpp - Ensure Linking Of Implementation -----===//
+//===- lib/Support/IncludeFile.cpp - Ensure Linking Of Implementation -----===//
 //
 //                     The LLVM Compiler Infrastructure
 //