re PR fastjar/9532 (jar -C flag is incompatible with Sun's (fastjar uses nonportable feature of getcwd))

	PR java/9532
	* jartool.c (main) Give proper error messages with -C, and
	check for missing arguments properly.  Send error messages
	to stderr.
	* jartool.c (add_to_jar): Make getcwd() call portable,
	and check for error return.

From-SVN: r67985