A simple hack with source that changes the AttnFlags to reflect a standard
68020.  This is known to cure at least one AGA "1200 only" demo to work on
an accelerated 1200.

 PERMSSN    UID  GID    PACKED    SIZE  RATIO     CRC       STAMP          NAME
---------- ----------- ------- ------- ------ ---------- ------------ -------------
[generic]                  666     916  72.7% -lh5- 9b16 Dec 14  1993 fake20
[generic]                 1024    1856  55.2% -lh5- 355c Jan  1  1994 fake20.doc
[generic]                  339     498  68.1% -lh5- 87da Jan  1  1980 fake20.e
[generic]                  204     300  68.0% -lh5- ebb4 Jan  1  1994 Fake20.readme
---------- ----------- ------- ------- ------ ---------- ------------ -------------
 Total         4 files    2233    3570  62.5%            Jan  2  1994