VMS: Fix run of generic generator programs in descrip.mms.tmpl
For a generic program, always go through the MCR utility.
@@ -984,7 +984,7 @@ EOF
$gen0 = platform->bin($gen0);
return <<"EOF";
$args{src} : $gen0 $deps
- PIPE $gen0$gen_args > \$@
+ PIPE MCR $gen0$gen_args > \$@
EOF
} else {
#
