This restricts direct usage of global oseq so that all accesses are
locked and threads are not racing to get oseq values that they did not
claim.

This also fixes a build error in res_pktccops under dev mode.

(closes issue ASTERISK-23100)
Reported by: adomjan
Patch by: adomjan
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Merged revisions 406037 from http://svn.asterisk.org/svn/asterisk/branches/1.8
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Merged revisions 406038 from http://svn.asterisk.org/svn/asterisk/branches/11
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Merged revisions 406049 from http://svn.asterisk.org/svn/asterisk/branches/12


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@406078 65c4cc65-6c06-0410-ace0-fbb531ad65f3