(Re-)added the Deskpro 386, but only in the development/incomplete section of the code definitions.

Selected XT and AT clones can use either their built-in FDC controller or an external one (the IBM AT and Compaq AT machines don't support booting from a 1.44M floppy so this makes the external floppy useful).
Added the FDC to the Adaptec AHA-154xCF ("2" variant) and defaulted to None to keep compatibility with existing FDC's.

src/win/win_settings.c

@@ -1628,7 +1628,6 @@ recalc_fdc_list(HWND hdlg)
     }
     if (!found_card)
 	SendMessage(h, CB_SETCURSEL, 0, 0);
-    EnableWindow(h, (machines[temp_machine].flags & MACHINE_FDC_FIXED) ? FALSE : TRUE);
 }