package/mtools: bump to version 4.0.42
Release announce:
https://lists.gnu.org/archive/html/info-mtools/2022-10/msg00000.html
For change log since 4.0.38, see:
https://svn.savannah.gnu.org/viewvc/mtools/tags/4.0.42/NEWS?view=markup
Signed-off-by: Julien Olivain <ju.o@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>