Make format_vorbis_ogg compile on OpenBSD

(closes issue #13639)
Reported by: mvanbaak
Patches:
      2008100700_oggsupportOBSD.diff.txt uploaded by mvanbaak (license 7)
      2008100700_oggsupportOBSD-configurescript.diff.txt uploaded by mvanbaak (license 7)
Tested by: mvanbaak


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@147347 65c4cc65-6c06-0410-ace0-fbb531ad65f3