removing useless header

Author: joaosaffran

llvm/lib/Object/DXContainer.cpp

@@ -8,7 +8,6 @@
 
 #include "llvm/Object/DXContainer.h"
 #include "llvm/BinaryFormat/DXContainer.h"
-#include "llvm/MC/DXContainerRootSignature.h"
 #include "llvm/Object/Error.h"
 #include "llvm/Support/Alignment.h"
 #include "llvm/Support/FormatVariadic.h"