multimedia/cx88: fix build with base system PIE default

PIE with static libraries is currently unsupported in the FreeBSD base
system. Explicitly disable PIE for in affected ports for now.

PR: 253275
Submitted by: Dawid Gorecki <dgr@semihalf.com>
Approved by: jah (maintainer), lwhsu
Differential Revision: https://reviews.freebsd.org/D28869