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
_Z16GetAddressOfDataRiRPvS1_ @ 1 NONAME
TestDataSize @ 2 NONAME DATA 4
WritableTestData @ 3 NONAME DATA 65536
PointerToStaticData @ 4 NONAME DATA 4
PointerToWritableData @ 5 NONAME DATA 4