Extract file_contexts from zips if it exists

Update binary will now extract file_contexts if it exists in the
root of the zip to /tmp

Recovery will replace the existing /file_contexts in the ramdisk
if file_contexts exists in the root of the zip.

This ensure that the proper contexts are used during zip installs.

Change-Id: If22c41101868643b67e6dba6177677c078fcd877
diff --git a/updater/install.c b/updater/install.c
index 305703c..d8c6dc2 100644
--- a/updater/install.c
+++ b/updater/install.c
@@ -37,6 +37,7 @@
 #include "mtdutils/mtdutils.h"
 #include "updater.h"
 #include "applypatch/applypatch.h"
+#include "flashutils/flashutils.h"
 
 #ifdef USE_EXT4
 #include "make_ext4fs.h"