Update for llvm API change.

llvm-svn: 186450
diff --git a/lld/lib/ReaderWriter/Native/WriterNative.cpp b/lld/lib/ReaderWriter/Native/WriterNative.cpp
index 1ab2b1e..886a07a 100644
--- a/lld/lib/ReaderWriter/Native/WriterNative.cpp
+++ b/lld/lib/ReaderWriter/Native/WriterNative.cpp
@@ -52,7 +52,7 @@
 
     std::string errorInfo;
     llvm::raw_fd_ostream out(outPath.data(), errorInfo,
-                              llvm::raw_fd_ostream::F_Binary);
+                             llvm::sys::fs::F_Binary);
     if (!errorInfo.empty())
       return error_code::success(); // FIXME