MFH: r448998 r449000 r449020

Add base/port options for libpcap

PR: 221923
Approved by: ehaupt (maintainer)

Correctly define the _DESC values

Reported by: ehaupt,mat

Fix OPTIONS_SINGLE logic. The two options (LIBPCAP_BASE and LIBPCAP_PORTS) need
to be mutually exclusive.

If LIBPCAP_BASE is selected, make sure the binary is linked against the libpcap
from base, even if net/libpcap is present.

Bump PORTREVISION to make sure the OPTIONS change is tracked.

Reported by: jbeich

Approved by: ports-secteam (with hat)