SSLFacility: improve warning about too old Poco
SSLFacility: improve warning about too old Poco

It is helpful to know what was the value POCO_VERSION
during compilation.

Fixes: 4159deaf52d5 ("SSLFacility: provide property disabledProtocols")
Signed-off-by: Jan Viktorin <3eab6ac54c005c4408f608556a6663b7f2abede7@fit.vutbr.cz>

BeeeOn/server,BeeeOn/server,BeeeOn/server,BeeeOn/server