package/sslh: bump to version 1.22c

- pcre2 is mandatory since version 1.22b and
  https://github.com/yrutschle/sslh/commit/37d275670345bc177d4081d7d348c0943f743132
- Drop patch (not needed anymore)

https://github.com/yrutschle/sslh/blob/v1.22c/ChangeLog



Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>