Re-enable optimiser in 2001/williams

The bugs.md was updated to remind people when debugging crashes that it
would be wise to have -O0 and -g (or if they can -ggdb3). That should be
noted in general for debugging but it's especially useful for crashes
and I'm trying to get this part done so I can resume 2019.

bugs.md

@@ -302,6 +302,9 @@ crashes.
 NOTE: this does NOT apply to entries under the INABIAF status (though they're
 not mutually exclusive in some cases).
 
+REMINDER: if you're debugging a crash it will be very helpful to have `-O0 -g`
+or if you can `-ggdb3` when compiling as that will help with debugging symbols.
+
 
 ## STATUS: uses gets() - change to fgets() if possible