GccParser: Consider multiple definition an error

Change-Id: I0048944f5fda066bc97552a81b57d24f8a14f55d
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>
LdParser: Do not interpret .data as a source filename

Change-Id: Ide088490db3c48f5036cc2969d4841e08d9a15cd
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>