for each of the continuation lines, rather than using backslashes to
continue a single, long definition. This makes it much easier to spot
pre-requisite packages and other dependencies.
o use DISTNAME and PKGNAME instead of DISTFILES
o replace rm by ${RM}, chmod by ${CHMOD}, pax by ${PAX}, echo by ${ECHO}
o reorder lines, remove unnecessary blank
o modify pkg/COMMENT and pkg/DESCR
o remove lines from files/patch-sum for files that aren't there
