2007-12-25  Yoshinori Tahara  <read.eval.print@gmail.com>

	* iconv.lisp (get-errno): use erron again. if sbcl
	sb-alien:get-errno, if cmu unix:unix-errno, else __errno_location.

2007-12-24  Yoshinori Tahara  <read.eval.print@gmail.com>

	* iconv.lisp (iconv):
	use cffi.
	not use errno.
	delete error-p argument.
	second return value is t or nil which success or failed.
	from-code and to-code are string or symbol.

2006-03-26  Yoshinori Tahara  <read.eval.print@gmail.com>

	* iconv.lisp (iconv): fix errno problem(only sbcl)
	Thanks Dmitry Petukhov.