dns/powerdns-recursor: fix build and update

Don't add -L/usr/lib unconditionally, it makes gcc8 (used on gcc architectures) link to base libstdc++.
Update to 4.1.13.

PR: 237947
Approved by: tcberner (mentor), tremere@cainites.net (maintainer)
Differential Revision: https://reviews.freebsd.org/D20423