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
?Function3@@YAHXZ @ 1 NONAME ; int __cdecl Function3(void)
?Function4@@YAHXZ @ 2 NONAME ; int __cdecl Function4(void)
?GetDll3Data@@YAHXZ @ 3 NONAME ; int __cdecl GetDll3Data(void)
?SetDll3Data@@YAXH@Z @ 4 NONAME ; void __cdecl SetDll3Data(int)