yay for airplane ride optimizations... sort the fields in ast_channel by...

yay for airplane ride optimizations... sort the fields in ast_channel by alignment requirements, saving 36 bytes per instance on a 64-bit platform



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@126187 65c4cc65-6c06-0410-ace0-fbb531ad65f3