Minor update to hostboot linker to support gcc4.9
Minor update to hostboot linker to support gcc4.9

Change-Id: I96ad2aff81ad5695f175fbdea3fe0ecbae4f1654
RTC: 123430
Reviewed-on: http://gfw160.aus.stglabs.ibm.com:8080/gerrit/15627
Tested-by: Jenkins Server
Reviewed-by: A. Patrick Williams III <c87e37b1a4035affd737b461af89fb722d635f4d@us.ibm.com>

open-power/hostboot,open-power/hostboot,alvintpwang/hostboot,csmart/hostboot,open-power/hostboot,alvintpwang/hostboot,alvintpwang/hostboot,csmart/hostboot,alvintpwang/hostboot,open-power/hostboot,Over-enthusiastic/hostboot,csmart/hostboot,Over-enthusiastic/hostboot,Over-enthusiastic/hostboot,open-power/hostboot,csmart/hostboot,alvintpwang/hostboot,Over-enthusiastic/hostboot,csmart/hostboot,Over-enthusiastic/hostboot