[Unix-jun72] more corrections

[Tim Newsham]

> I adjusted my tools/dumpaout.py appropriately and tested with the 1ed
> assembler.  If you sed all the files to s/mount/xmount/ it builds just
> fine with 1ed "as" and the a.out header is indeed 6 bytes long and
> is included in the text segment...  Everything is lining up..

added tools/assem which builds using the 1ed "as".

Tim Newsham
http://www.thenewsh.com/~newsham/