Fix DJGPP configury due to some bitrot:

Fix DJGPP configury due to some bitrot:

	* config/djgpp/fnchange.lst: Group renames for opcode directory
	together.

	* config/djgpp/djconfig.sh: Replace file names that don't exist
	anymore with existing files, for checking the unpacked
	distribution.

	* config/djgpp/config.sed (am_cv_exeext, lt_cv_sys_max_cmd_len):
	Export pre-cooked values in configure-* targets that begin with
	"@test -f stage_last".