new beta release

[<don...@is...>]

Bruno Haible writes:
 > Hi all,
 > 
 > clisp 2.49.90 is available at
 >   https://haible.de/bruno/gnu/clisp-2.49.90.tar.bz2

Is this is different from the result of hg pull -u that I test nightly?
If it were the same it would be a lot easier for me to test.