*/*: Bump multimedia/openh264 consumers after dc94e017

net/freerdp{,3} have been already bumped in e447cd0c, 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)