Unbreak build with gcc 4.3: provide missed includes and silence most annoying warnings.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47367 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Archive/Archive.cpp

@@ -18,6 +18,8 @@
 #include "llvm/Module.h"
 #include "llvm/Support/MemoryBuffer.h"
 #include "llvm/System/Process.h"
+#include <memory>
+#include <cstring>
 using namespace llvm;
 
 // getMemberSize - compute the actual physical size of the file member as seen