Revert "Revert "rusty-gd: add stack start stubs, define shim lib..."

Revert submission 1518559-revert-1512686-LIHRZNOOWL

Reason for revert: build system fixed
Reverted Changes:
I760eea76d:Revert "rusty-gd: add stack start stubs, define sh...
I5740575cf:Revert "rusty-gd: move init_flag parsing to rust"
I0cfbe779c:Revert "rusty-gd: compile into libbluetooth"

Change-Id: I5f0f76450889d7906e9a763a4ebc5a46daf673b7