Cleanup of redundant/useless header file inclusion.
ISC style lint, primarily for function declarations and standalone
comments -- ie, those that appear on a line without any code, which
should be written as follows:
/*
* This is a comment.
*/
return an isc_logconfig_t. isc_log_cretechannel and isc_log_usechannel
now take an isc_logconfig_t instead of an isc_log_t; this is to address
reconfiguration in a multithreaded environment.
isc_logconfig_create, isc_logconfig_get, isc_logconfig_use and
isc_logconfig_destroy were added to work with the new isc_logconfig_t type.
isc_logregister_categories and dns_log_init are now both void rather than
returning isc_result_t.
