include/asterisk/ael_structs.h:

  - protect against multiple includes of ael_structs.h
  - remove prototypes for unused or undeclared functions

pbx/ael/ael.y
  - staticize functions as appropriate
  - constify arguments
  - remove useless extern

pbx/ael/ael.flex
  - ifdef out unused functions

pbx/pbx_ael.c
  - constify some variables and arguments
  - ifdef out unused functions
  - staticize functions as appropriate

update generated files accordingly 



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@22654 65c4cc65-6c06-0410-ace0-fbb531ad65f3