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
KeyDataConvTable__FR10SConvTableRUiT1R18SScanCodeBlockListR12SKeyCodeList @ 1 NONAME ; KeyDataConvTable(SConvTable &, unsigned int &, unsigned int &, SScanCodeBlockList &, SKeyCodeList &)
KeyDataFuncTable__FR11SFuncTables @ 2 NONAME ; KeyDataFuncTable(SFuncTables &)
KeyDataSettings__FR6TRadixR22TCtrlDigitsTerminationRiT2 @ 3 NONAME ; KeyDataSettings(TRadix &, TCtrlDigitsTermination &, int &, int &)