Simple little program to convert hex format file into a binary file.  Reads
lines of hex characters on stdin and writes 8 bit dehex'd bytes to stdout.

 PERMSSN    UID  GID    PACKED    SIZE  RATIO     CRC       STAMP          NAME
---------- ----------- ------- ------- ------ ---------- ------------ -------------
[generic]                 6907   15192  45.5% -lh5- 9069 Feb  2  1986 dehex/dehex
[generic]                  206     424  48.6% -lh5- a882 Feb  2  1986 dehex/dehex.c
---------- ----------- ------- ------- ------ ---------- ------------ -------------
 Total         2 files    7113   15616  45.5%            Feb  2  1987