Don't fetch exception lists on servers that don't support them.
Don't fetch exception lists on servers that don't support them.

Instead of filtering out exceptions-related commands, simply don't request the
exception lists if ISUPPORT didn't advertise the ircd's support for them.

gmt2001/SmartIrc4net,meebey/SmartIrc4net,RavuAlHemio/SmartIrc4net,Thoorium/SmartIrc4net,gmt2001/SmartIrc4net,Thoorium/SmartIrc4net,kabili207/SmartIrc4net,kabili207/SmartIrc4net,Jaykul/SmartIrc4net,Jaykul/SmartIrc4net,meebey/SmartIrc4net,RavuAlHemio/SmartIrc4net,djkaty/SmartIrc4net,djkaty/SmartIrc4net