AK3: add simple arch detect to optionally support arm + x86 in same zip

- for use with broad zips targetting many devices including different architectures
- enable support by putting current tools binary contents in tools/arm and adding tools/x86

(thanks @Zackptg5 for the nudge)

META-INF/com/google/android/update-binary

@@ -71,6 +71,17 @@ unzip -o "$ZIPFILE";
 if [ $? != 0 -o ! "$(ls tools)" ]; then
   abort "Unzip failed. Aborting...";
 fi;
+for arch32 in x86 arm; do
+  if [ -d $home/tools/$arch32 ]; then
+    bb=$home/tools/$arch32/busybox;
+    chmod 755 $bb;
+    $bb >/dev/null 2>&1;
+    if [ $? == 0 ]; then
+      $bb mv -f $home/tools/$arch32/* $home/tools;
+      break;
+    fi;
+  fi;
+done;
 bb=$home/tools/busybox;
 chmod 755 $bb;
 $bb chmod -R 755 tools bin;