Update configure script to check for OSP toolkit 3.5.0.

(closes issue #14988)
Reported by: tzafrir
Patches:
      configure.ac.diff uploaded by homesick (license 91)
      new_ast_check_osptk.m4 uploaded by homesick (license 91)


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@196946 65c4cc65-6c06-0410-ace0-fbb531ad65f3