Fix start and end radial endpoint calculations which were totally wrong.

Fix start and end radial endpoint calculations which were totally wrong.

	* gdk/win32/gdkdraw.c (gdk_draw_arc): Fix start and end radial
	endpoint calculations which were totally wrong. (A little RTFMing
	helps a lot ;-)

	* gtk/makefile.{cygwin,msc}: Use libintl extracted from glibc
	from a separate directory, not from gettext, because of licensing
	issues (we want to use the LGPL version).

	* README.win32: Mention the intl from glibc vs from gettext issue.