Object files from elsewhere under out/ should never have been included,
because they are not part of webrtc itself, but rather side-effect build
artifacts like gn. Including those extraneous .o files was mostly
harmless (except for library size), because on linux they happened to be
the same architecture as the webrtc.o files. However it won't work for
the mac build (because libwebrtc-magic.a would include a mix of linux
ELF and mac Mach-O objects). Additionally, build_time.o, part of the gn
build, embeds a timestamp with month resolution, causing a failure of
reproducibility, as found at https://bugs.torproject.org/22832.

tor-browser-bundle.git author: David Fifield <david@bamsoftware.com>
tor-browser-bundle.git commit: 781da76f120f849416c772cef45a9a9a103b4eef