The following files are forked:
- build-globs.ninja
- The glob list files
- .d files for the glob list files
- The output file (build.ninja or the bp2build marker file)
This makes bp2build and soong_build not overwrite each other's files
they need for proper incrementality.
Test: Presubmits.
Change-Id: I69d192cbd36ecd9677f46f3fa095dfce6f872227