Created attachment 4194 [details] diffoscope output comparing two builds. Please see the attached diffoscope output. Build host build directory path is present in various places. (Possibly other build host leaks as well)
Fixed by this patch: http://git.yoctoproject.org/cgit/cgit.cgi/poky/commit/?id=7f6b919759902df4d2665e0d72671b53988c5f0a