*/*: Bump multimedia/openh264 consumers after dc94e01

net/freerdp{,3} have been already bumped in e447cd0, so not being bumped
again.

Bumped by the following one-liner:

$ git grep -l libopenh264 | \
    grep '^.*/.*/Makefile$'| \
    xargs -t -n1 portedit bump-revision -i

Approved by: portmgr (blanket)