package/putty: security bump version to 0.74

package/putty: security bump version to 0.74

Reformatted hashes, added md5 hash provided by upstream.

Release notes:
https://lists.tartarus.org/pipermail/putty-announce/2020/000030.html

Fixes CVE-2020-14002:
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-14002

Updated license hash due to upstream commits adding copyright holders
and bumping the copyright year:
https://git.tartarus.org/?p=simon/putty.git;a=history;f=LICENCE;h=3e1d146289644749b3578f610c74715fa1c6bf0d;hb=HEAD

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Reviewed-by: Alexander Dahl <post@lespocky.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>