Add better support for setting default debug level in Android apps

Submitted by Sebastian Dröge (slomo)

Link to original bug (#756929)

Description

+++ This bug was initially created as a clone of Bug 756620 +++

Currently this is automatically set based on gstreamer_android-1.0.c.in and not changeable. It would probably be good to have at least something for Android.mk to modify it.

Version: 1.6.0