From PR pkg/23650 by Luc Beurton luc at black-kettle dot univ-ubs dot fr.
While here claim stewardship, use subst.mk framework, and fix a typo
in a patch file.
Bump PKGREVISION.
yale-tftpd is an improved (but slightly incompatible until you configure it)
tftpd server. It has a powerful and configurable security setup and is well
suited for people who want to boot network devices using their system as a
TFTP server.