devel/collada-dom: fix build under 14-CURRENT

Supply pkgconfig so minizip is found. This stops the port from
building its own bundled minizip, avoiding build problems with
LLVM 15 as used on 14-CURRENT.

PR: 269628
MFH: 2023Q1
Approved by: eduardo (mentor)
Differential Revision: https://reviews.freebsd.org/D38689