Merge pull request #1110 in FS/freeswitch from ~SEBASTIAN/freeswitch:bugfix/FS-9840-fix-some-warnings-V2 to master

* commit '8c94e6f5':
  FS-9840 mod_avmd: Fix implicit declaration warning
  FS-9840 sofia-sip: fix implicit declaration warning
  FS-9840 mod-verto: fix implicit declaration warning
  FS-9840 mod_sofia: fix redefine warning