Log message:
Update of icon to 9.4.1.

Changes:

*  Support for NetBSD on PowerPC based systems.

*  An  Icon source file can be made executable under Unix by prefixing it
   with a comment line

     #!/usr/bin/env icon

   and setting its execute permission bit.  This uses a new icon command,
   which in another form allows a small Icon program to be embedded within
   a shell script. See the new man page for details. The traditional icont
   command remains available for less specialized purposes.

*  The performance of large sets and tables has been improved.

*  Some minor bugs have been fixed.

Log message:
Replace "true" by "${TRUE}".