gdb/

gdb/
	Code cleanup.
	* main.c (struct cmdarg): Move it here from main.  Add more comments.
	(cmdarg_s, VEC (cmdarg_s)): New.
	(main): Move struct cmdarg from here.  New variables cmdarg_vec and
	cmdarg_p.  Remove variables cmdsize and ncmd and their initialization.
	Install cleanup for cmdarg_vec.  Update filling for options 'x' and
	'X'.  Replace cmdarg processing by cmdarg_vec processing.  Remove xfree
	of CMDARG.