Upgrade from 0.41 to 0.42. Use configure and otherwise simplify the
port. Resolve compiler-warnings (mostly about signed vs. unsigned
char).

Do not install the COPYING-file -- it is nothing but the recitation
of GPLv2 -- declare GPLv2 as LICENSE instead.

Do not install the README -- there is nothing in it, that the
man-page does not cover.

With only two files remaining -- the program and the man-page --
do away with pkg-plist and simply list the two in PLIST_FILES.