Update finsig_dryos.c to allow firmware functions to be marked as 'unused'.
Unused functions are commented out in stubs_entry.S so no code is generated; but address is available for reference.
Module update:
- allow up to four 'simple' modules to be loaded (prev only 1 allowed)
- restore ability to run a 'simple' module from the file browser.
http://chdk.setepontos.com/index.php?topic=9532.msg100446#msg100446
Fix nrflag for IXUS 125 from nafraf:
http://chdk.setepontos.com/index.php?topic=650.msg100467#msg100467