Log Message:
Update Guile to 1.6.1.

Changes since Guile 1.6.0:

* Changes to the distribution
	** Guile now provide and uses an "effective" version number.
	** Guile now uses it's own version of libltdl.
	** The Emacs interface has been fixed.
	** The SRFI C headers are now installed.
* Changes to Scheme functions and syntax
	** New function: effective-version
* Changes to the C interface
	** New function: scm_effective_version