AJCORE-314 Export objects used to build alljoyn_unity_native library

Unity no longer uses the alljoyn_c shared library instead it uses the
alljoyn_unity_native library that has the bundled daemon built into the
library its self.

This will also help to separate unity specific code from the C language
bindings.

Change-Id: Ia33a9034b736fec1b35d4d8022ef12781afcf180