upstream switched from autotools to meson, thus all libtool file
are gone. Rebuild all ports dependent on libdrm to fix wrong entries
in their *.la files, probably most of xorg-xf86-video-*.
Use the following script to find problematic ports:
for f in $(grep -lrs libdrm.la /usr/lib); do pkginfo -o $f | \
awk '!/^Package/ {print $1}'; done | sort -u