sysutils/usbtop: reduce dependencies
- Drop net/libpcap in favor of /usr/lib/libpcap.so from base
- Drop 166 MiB large boost-libs from RUN_DEPENDS
PR: 257698
Approved by: yuri (maintainer)
(cherry picked from commit ec7d5f1eb92d9a150b838ba431389cc2af1d3718)