* app/appenv.h: Add G_SQRT2.

	* app/iscissors.c: Use it.

	* app/makefile.{cygwin,msc}: Add new files.

	* */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 in GTk+, so use it here, too).