atk build from cvs broken for win32 (mingw)

[Tor Lillqvist <tml iki fi>]

Hans Breuer writes:
 > Following Owen's nice mingw build descriptions [1] everything went smooth 
 > until atk which gives:

 > libtool: link: CURRENT `1000' is not a nonnegative integer

Find this in libtool:

	# Check that each of the things are valid numbers.
	case $current in
	0 | [1-9] | [1-9][0-9] | [1-9][0-9][0-9]) ;;

Change to:

	0 | [1-9] | [1-9][0-9] | [1-9][0-9][0-9] | [1-9][0-9][0-9][0-9]) ;;

--tml