sslh: update to v1.23.1

sslh: update to v1.23.1

The sslh Makefile's default target "all" now also tries to compile a new version sslh-ev.
To disable its compilation the Build/Compile is overridden and to call directly "make sslh-select" or "make sslh-fork" depending on CONFIG_SSLH_SELECT.

Some changes from 001-configfile-fix.patch were applied to the upstream and we can remove them.
The only left is a notice "sslh command line arguments override the config".

Signed-off-by: Sergey Ponomarev <stokito@gmail.com>