ext/srfi/srfi-19.scm license considered non-free by debian

Hi,

I just saw debian bug #1023035
https://bugs.debian.org/cgi-bin/bugreport.cgi?archive=yes&bug=1023035

The license of ext/srfi/srfi-19.scm contains:
"However, this document itself may not be modified in any way"
which makes the license non-free in debian terms

Looking at the current srfi-19.scm file [0] the new license doesn't
contain such restriction anymore:

"
;; SRFI-19: Time Data Types and Procedures.
;;
;; Copyright (C) I/NET, Inc. (2000, 2002, 2003). All Rights Reserved.
;;
;; Permission is hereby granted, free of charge, to any person obtaining
;; a copy of this software and associated documentation files (the
;; "Software"), to deal in the Software without restriction, including
;; without limitation the rights to use, copy, modify, merge, publish,
;; distribute, sublicense, and/or sell copies of the Software, and to
;; permit persons to whom the Software is furnished to do so, subject to
;; the following conditions:
;;
;; The above copyright notice and this permission notice shall be
;; included in all copies or substantial portions of the Software.
;;
;; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
;; EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
;; MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
;; NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
;; LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
;; OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
;; WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
"

Would it be possible to adapt the license of ext/srfi/srfi-19.scm ?

Greetings,
jens

[0] https://srfi.schemers.org/srfi-19/srfi-19.scm