Preserve license files, for inclusion in acknowledgements#2

Merged

hmhv merged 2 commits intohmhv:devfrom

signalapp:jrose/acknowledgements

Feb 25, 2021

Commits on Feb 2, 2021

Check top-level build directories as well as target-specific ones
jrose-signal
committed
Preserve license files, for inclusion in acknowledgements
jrose-signal
committed