vndk-def: Refactor compute_sp_lib() return value

This commit adds SPLibResult namedtuple to hold the return value of
ELFLinker.compute_sp_lib().

Test: ./tests/run.py
Change-Id: I53704e5fdb41571a375f41c6917f57f489b40e92
(cherry picked from commit fbd41493b10868b0b394c1b96135773e86c953da)
2 files changed