Merged revisions 210237 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.4

........
  r210237 | kpfleming | 2009-08-04 09:51:39 -0500 (Tue, 04 Aug 2009) | 10 lines
  
  Eliminate spurious compiler warnings from system headers on *BSD platforms.
  
  Ensure that system headers located in /usr/local/include are actually treated
  as system headers by the compiler, and not as local headers which are subject
  to warnings from the -Wundef compiler option and others.
  
  (closes issue #15606)
  Reported by: mvanbaak
........


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@210238 65c4cc65-6c06-0410-ace0-fbb531ad65f3