net/asterisk{20,22}: Fix build with WITH_PIE

Upstream commit f82393d brokes build options handling for
bundled pjproject. That was fixed later by 78b7c4e.
Temporary use this patch in our ports until next release.

PR: 298207
Co-authored-by: Marek Zarychta <zarychtam@plan-b.pwste.edu.pl>
Sponsored by: FLEX-IT LLC
MFH: 2026Q3