Kawa now recognizes "coding* declaration in source files

[Per Bothner]

You can now put an Emacs-style "coding" declaration
(which is also supported by Guile) in a comment in line 1 or 2.
E.g.:
;; -*- coding: utf-8 -*-

The actual recognized regex is:
   coding[:=]\s*([-a-zA-Z0-9]+)
See LispReader:checkEncodingSpec.

With this (and some other changes) testsuite/r7rs-tests.scm
passes on Windows.
-- 
	--Per Bothner
per@bothner.com   http://per.bothner.com/