Obtained from: Todd Miller <millert@openbsd.org> (OpenBSD rev 1.3)
register keyword, and -Wall cleaning. Obtained from: similar changes in NetBSD
This will make a number of things easier in the future, as well as (finally!) avoiding the Id-smashing problem which has plagued developers for so long. Boy, I'm glad we're not using sup anymore. This update would have been insane otherwise.