tutorials/android: Update for NDK r18 changes

Matthew Waters requested to merge ystreet/gst-docs:android into master

libc++_shared needs to be enabled in the application in order for it to be included and used correctly for c++ plugins.

Only symbols from libraries explicitly mentioned are exported from libgstreamer_android.so so we need to add a couple of deps to be able to access the necessary functions.

Requires cerbero!31 (merged) cerbero!1 (merged)

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