Cygwin doesn't like .. through a link, so drop the ..


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19076 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/System/Cygwin/MappedFile.cpp b/lib/System/Cygwin/MappedFile.cpp
index 09a0575..94338de 100644
--- a/lib/System/Cygwin/MappedFile.cpp
+++ b/lib/System/Cygwin/MappedFile.cpp
@@ -13,6 +13,6 @@
 //===----------------------------------------------------------------------===//
 
 // Include the generic unix implementation
-#include "../Unix/MappedFile.cpp"
+#include "Unix/MappedFile.cpp"
 
 // vim: sw=2 smartindent smarttab tw=80 autoindent expandtab