New header fix for gcc 4.7 build.

Change-Id: I09b49368c19d3bfb3a81d8e23b0dacf596d3bda7
diff --git a/compiler/elf_stripper.cc b/compiler/elf_stripper.cc
index b8cc5c0..42291b2 100644
--- a/compiler/elf_stripper.cc
+++ b/compiler/elf_stripper.cc
@@ -16,6 +16,8 @@
 
 #include "elf_stripper.h"
 
+#include <unistd.h>
+#include <sys/types.h>
 #include <vector>
 
 #include "UniquePtr.h"