Required fixes:
- Set MakeLinkType for libraries, even in mixed build mode.
- Set snapshot header information to empty list, which passes
validation logic for depending modules
Fixing these libraries also requires a Starlark change to
cc_library_static.bzl, which will be submitted separately.
Additionally, this adds better error messaging in the event that
output files are missing from a mixed-build library.
Test: USE_BAZEL_ANALYSIS=1 m libc
Test: USE_BAZEL_ANALYSIS=1 m runtime-module-sdk
Change-Id: Iad2c4d46359986fb0a43263292a15ed45fabbac7
