Enhance the base/rom extension to generate the symbol file of the rom built.
The symbol file is placed in epoc32/rom/<baseport_name>, along with the rom log and final oby file.
EXPORTS
_Z3barv @ 1 NONAME
_ZN10CMessenger10ConstructLERK7TDesC16 @ 2 NONAME
_ZN10CMessenger11ShowMessageEv @ 3 NONAME
_ZN10CMessenger5NewLCER12CConsoleBaseRK7TDesC16 @ 4 NONAME
_ZN10CMessengerC1ER12CConsoleBase @ 5 NONAME
_ZN10CMessengerC2ER12CConsoleBase @ 6 NONAME
_ZN10CMessengerD0Ev @ 7 NONAME
_ZN10CMessengerD1Ev @ 8 NONAME
_ZN10CMessengerD2Ev @ 9 NONAME
_ZTI10CMessenger @ 10 NONAME ; #<TI>#
_ZTV10CMessenger @ 11 NONAME ; #<VT>#
myfoo @ 12 NONAME