replace true(1) and false(1) with simple shell scripts

[David Cuthbert]

Matthew Dillon wrote:
    We are going to stick with the C version.  There is no reason to nerf
    the performance of the programs even if one assumes that they will
    hardly ever be used in a time-critical situation.  It certainly isn't
    worth the byte-savings for the files since they are already only
    3280 bytes each.
But the assembly versions allow the following loop to run in half the time:

    while true; do done;

;-)