So that we can represent other files that get generated along with the
objects, like the gcno coverage information, and per-file clang-tidy
runs.
Test: Soong's build.ninja identical before/after
Change-Id: I5c553a153c436d5403549f62c73fe79c5f101779
Support prebuilt shared libraries as an initial proof-of-concept of
prebuilts. Future changes will support binaries and static libraries,
and the ability to select which to use based on something besides
blueprint properties.
Test: TestPrebuilts run during m -j
Change-Id: I6e84da667e9005ae11844bad01d25cbe4ced1ce3