Dynamically assemble the list of python launcher shared libs for precompiling

Still fall back to the hardcoded list for what to put in LOCAL_SHARED_LIBRARIES,
because I couldn't figure out a good way to get those modules at the moment.

Bug: 259718110
Test: Presubmits
Change-Id: Ia992ffea8819d8c67280b08bc45505f77af09de0