Log Message:
Import dasm from pkgsrc-wip.  Packaged by mor (mor at linex dot com)
in PR pkg/19899 and modified by me.

DASM is a highly evolved cross-assembler for 6502, 6803 and 68HC11
processors.  It is very popular for hacking/cross-developing on old
6502-based video game systems from Atari, Nintendo, etc.  DASM
processes output from the Distella Atari ROM disassembler without
modification.