Please update license on SRFI-38 implementation

[weinholt]

The SRFI-38 implementation in Larceny is also being distributed with various portable SRFI collections. Part of it carries a restrictive license that doesn't permit modifications. It was originally taken from the reference implementation, which in 2005 was changed to the MIT license: https://srfi.schemers.org/srfi-38/srfi-38.html

I'm trying to clean up the licenses in the portable SRFI collections. Larceny's SRFI-38 implementation has been modified by Will Clinger, so it's not clear that anyone else can relicense that particular implementation. Please see if it's possible to change the notice under "Copyright (C) Ray Dillinger 2003. All Rights Reserved." to match what is on srfi.schemers.org.

The relevant file is: https://github.com/larcenists/larceny/blob/master/lib/SRFI/srfi/%253a38.sls