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@@YAXAAUSConvTable@@AAI1AAUSScanCodeBlockList@@AAUSKeyCodeList@@@Z @ 1 NONAME ; void __cdecl KeyDataConvTable(struct SConvTable &,unsigned int &,unsigned int &,struct SScanCodeBlockList &,struct SKeyCodeList &)
?KeyDataFuncTable@@YAXAAUSFuncTables@@@Z @ 2 NONAME ; void __cdecl KeyDataFuncTable(struct SFuncTables &)
?KeyDataSettings@@YAXAAW4TRadix@@AAW4TCtrlDigitsTermination@@AAH2@Z @ 3 NONAME ; void __cdecl KeyDataSettings(enum TRadix &,enum TCtrlDigitsTermination &,int &,int &)