more removal of duplicate #include lines

apps/app_db.c

cdr/cdr_pgsql.c

channels/chan_gtalk.c

channels/chan_h323.c

channels/chan_jingle.c

channels/chan_local.c

channels/chan_mgcp.c

channels/chan_misdn.c

channels/chan_skinny.c

channels/chan_unistim.c

funcs/func_enum.c

funcs/func_odbc.c

utils/ael_main.c