Add target to make a flashable su addon

Run 'make addonsu' to make a flashable zip to install the addon and
'make addonsu-remove' for a flashable zip that removes it.

Change-Id: I5b2fe67f98f2474b923c074dc6025b47c6db2ae0
diff --git a/addonsu/updater-script-remove b/addonsu/updater-script-remove
new file mode 100644
index 0000000..b89b572
--- /dev/null
+++ b/addonsu/updater-script-remove
@@ -0,0 +1,21 @@
+ui_print("Removing su addon...");
+ifelse(is_mounted("/system"), unmount("/system"));
+package_extract_file("mount-system.sh", "/tmp/mount-system.sh");
+set_metadata("/tmp/mount-system.sh", "uid", 0, "gid", 0, "mode", 0755);
+run_program("/tmp/mount-system.sh") == 0 || abort("Could not mount /system");
+
+if getprop("ro.build.system_root_image") != "true" then
+  delete("/system/addon.d/51-addonsu.sh");
+  delete("/system/bin/su");
+  delete("/system/etc/init/superuser.rc");
+  delete("/system/xbin/su");
+else
+  delete("/system/system/addon.d/51-addonsu.sh");
+  delete("/system/system/bin/su");
+  delete("/system/system/etc/init/superuser.rc");
+  delete("/system/system/xbin/su");
+endif;
+
+unmount("/system");
+ui_print("Done");
+set_progress(1.000000);