android: Add nice plugin to ndk-build plugins.mk
android: Add nice plugin to ndk-build plugins.mk

The nice plugin is needed for webrtc.

fluendo/cerbero,fluendo/cerbero,nirbheek/cerbero,atsushieno/cerbero,GStreamer/cerbero,atsushieno/cerbero,GStreamer/cerbero,nirbheek/cerbero,fluendo/cerbero,nirbheek/cerbero,fluendo/cerbero,atsushieno/cerbero,atsushieno/cerbero,GStreamer/cerbero,nirbheek/cerbero,atsushieno/cerbero,fluendo/cerbero,GStreamer/cerbero,GStreamer/cerbero