added missing grpclb.h dep in build.yaml
diff --git a/grpc.gemspec b/grpc.gemspec
index d30d7ae..dea6d4f 100755
--- a/grpc.gemspec
+++ b/grpc.gemspec
@@ -309,6 +309,7 @@
s.files += %w( src/core/ext/client_config/subchannel_call_holder.h )
s.files += %w( src/core/ext/client_config/subchannel_index.h )
s.files += %w( src/core/ext/client_config/uri_parser.h )
+ s.files += %w( src/core/ext/lb_policy/grpclb/grpclb.h )
s.files += %w( src/core/ext/lb_policy/grpclb/load_balancer_api.h )
s.files += %w( src/core/ext/lb_policy/grpclb/proto/grpc/lb/v1/load_balancer.pb.h )
s.files += %w( third_party/nanopb/pb.h )