[iovisor/bcc] trace: Incorrect symbol offsets when using build_id (#2161) (#2162)
[iovisor/bcc] trace: Incorrect symbol offsets when using build_id (#2161) (#2162)

Fix #2161 - bcc_bsymcache API returned absolute address instead of 
offset from start of the symbol

mcaleavya/bcc,brendangregg/bcc,iovisor/bcc,mcaleavya/bcc,iovisor/bcc,mcaleavya/bcc,tuxology/bcc,mcaleavya/bcc,tuxology/bcc,tuxology/bcc,iovisor/bcc,iovisor/bcc,tuxology/bcc,brendangregg/bcc,brendangregg/bcc,brendangregg/bcc,iovisor/bcc,tuxology/bcc,mcaleavya/bcc,brendangregg/bcc