Log Message:
Honor PKG_SYSCONFDIR and VARBASE, noticed in PR 36501.

  OLD LOCATION				NEW LOCATION
  /var/run/dtcpclient.pid		${VARBASE}/run/dtcpclient.pid
  ${PREFIX}/etc/dtcpclient.auth		${PKG_SYSCONFDIR}/dtcpclient.auth
  /usr/local/dtcpclient_script.conf	${PKG_SYSCONFDIR}/dtcpclient_script.conf