fcntl.h is pretty standard on unix (without the sys/)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50475 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Support/MemoryBuffer.cpp b/lib/Support/MemoryBuffer.cpp
index b170ea7..9c2eb42 100644
--- a/lib/Support/MemoryBuffer.cpp
+++ b/lib/Support/MemoryBuffer.cpp
@@ -26,11 +26,10 @@
 #if !defined(_MSC_VER) && !defined(__MINGW32__)
 #include <unistd.h>
 #include <sys/uio.h>
-#include <sys/fcntl.h>
 #else
 #include <io.h>
-#include <fcntl.h>
 #endif
+#include <fcntl.h>
 using namespace llvm;
 
 //===----------------------------------------------------------------------===//