res_rtp_asterisk: Fix building when pjproject is not used.
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Merged revisions 423207 from http://svn.asterisk.org/svn/asterisk/branches/11


git-svn-id: http://svn.asterisk.org/svn/asterisk/branches/12@423208 f38db490-d61c-443f-a65b-d21fe96a405b
res_rtp_asterisk: Fix 100% CPU usage due to timer heap thread spinning.

Side note: I need a vacation.
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Merged revisions 423210 from http://svn.asterisk.org/svn/asterisk/branches/11


git-svn-id: http://svn.asterisk.org/svn/asterisk/branches/12@423211 f38db490-d61c-443f-a65b-d21fe96a405b