Include obfsproxy and fteproxy pluggable transports in tor-browser-build.git
The build of the obfsproxy and fteproxy pluggable transports have not yet been converted to the new build system.
We should decide if we want to keep them, and convert them to the new build system, or if we want to not include them in Tor Browser anymore.
obfsproxy can be replaced by obfs4.