Allow the ABI to be nil in the layout resolvers.
Allow the ABI to be nil in the layout resolvers.

Return the host's binaries in case the ABI is nil.

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