dix: Remove MaxClients

This variable was no longer being read anywhere. MAXCLIENTS the macro is
the compile-time maximum limit, LIMITCLIENTS the macro is the default
limit, LimitClients the variable is the limit for the current server.

Signed-off-by: Adam Jackson <ajax@redhat.com>
1 job for fix-maxclients in 2 minutes and 23 seconds (queued for 2 seconds)