Be explicit about the ldscript location in the linkopts.
Be explicit about the ldscript location in the linkopts.

This is to fix building with bazel 0.17, where labels are no longer
automatically expanded.

google/agi,pmuetschard/gapid,google/agi,pmuetschard/gapid,google/agi,pmuetschard/gapid,Qining/gapid,google/gapid,pmuetschard/gapid,google/gapid,google/agi,Qining/gapid,Qining/gapid,google/gapid,google/gapid,google/agi,pmuetschard/gapid,pmuetschard/gapid,Qining/gapid,Qining/gapid,google/agi,google/gapid,google/agi,google/agi,Qining/gapid,pmuetschard/gapid,Qining/gapid,google/gapid,Qining/gapid,pmuetschard/gapid,google/gapid,google/gapid