each subdirectory.
 - the shell code in the for loop doesn't have a manually catch errors from
   make on a subdirectory
 - you can now run something like "make apps" or "make channels" from the root
   source directory
 - This should allow for better support for parallel instances of make (the -j
   option) since make can work on each subdirectory target in parallel


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@35436 65c4cc65-6c06-0410-ace0-fbb531ad65f3