ALLJOYN-1973: Remove Android NDK conditionals from SConscript files.

Change-Id: Ibc24e73deff526cf1fcd766b1b1171539d1cef92
ALLJOYN-2315: Fix build of stand-alone common unit tests.

Change-Id: Ib7fa3cdb7b6adde3b32966a87d4a5363446eb5a9