bootstrap: remove false cygwin protections.
bootstrap: remove false cygwin protections.

	* build-aux/bootstrap: Cygwin supports symlinks.
	And anyway instead of dying silently, try and fail verbosely.
	(link_hard): Remove, dead code.

aldebaran/libport,aldebaran/libport,aldebaran/libport,aldebaran/libport,aldebaran/libport