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
CreatePhysicalDevice__Fv @ 1 NONAME R3UNUSED ; CreatePhysicalDevice(void)
DfcFunc__20TIicBusSlaveCallbackPv @ 2 NONAME R3UNUSED ; TIicBusSlaveCallback::DfcFunc(void *)
__25DIicBusChannelMasterSlaveQ214DIicBusChannel8TBusTypeQ214DIicBusChannel14TChannelDuplexP20DIicBusChannelMasterP19DIicBusChannelSlave @ 3 NONAME ; DIicBusChannelMasterSlave::DIicBusChannelMasterSlave(DIicBusChannel::TBusType, DIicBusChannel::TChannelDuplex, DIicBusChannelMaster *, DIicBusChannelSlave *)
__31DSimulatedIicBusChannelSlaveSpiQ214DIicBusChannel8TBusTypeQ214DIicBusChannel14TChannelDuplex @ 4 NONAME R3UNUSED ; DSimulatedIicBusChannelSlaveSpi::DSimulatedIicBusChannelSlaveSpi(DIicBusChannel::TBusType, DIicBusChannel::TChannelDuplex)
__32DSimulatedIicBusChannelMasterSpiQ214DIicBusChannel8TBusTypeQ214DIicBusChannel14TChannelDuplex @ 5 NONAME R3UNUSED ; DSimulatedIicBusChannelMasterSpi::DSimulatedIicBusChannelMasterSpi(DIicBusChannel::TBusType, DIicBusChannel::TChannelDuplex)