Android: Initial support for arm64-v8a, x86_64, mips64 architectures.

The new default compler is gcc 4.9, it is needed to compile
64 architectures.

Change-Id: I7ccbac7615b6dc20f5b0441908590de7d4a2e8cb
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Paul Olav Tvete <paul.tvete@theqtcompany.com>