Remove uses of llvm/System/IncludeFile.h that are no longer needed.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50695 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/System/DynamicLibrary.h

@@ -15,7 +15,6 @@
 #define LLVM_SYSTEM_DYNAMIC_LIBRARY_H
 
 #include "llvm/System/Path.h"
-#include "llvm/System/IncludeFile.h"
 #include <string>
 
 namespace llvm {
@@ -96,6 +95,4 @@ namespace sys {
 } // End sys namespace
 } // End llvm namespace
 
-FORCE_DEFINING_FILE_TO_BE_LINKED(SystemDynamicLibrary)
-
 #endif // LLVM_SYSTEM_DYNAMIC_LIBRARY_H