[pkg-go] Bug#893171: build failure when updating golang-google-grpc to 1.11

[Pirate Praveen]

I get the following error in sbuild. Can someone help? A newer grpc is
required for golang-gitaly-proto.

 debian/rules build
dh build --buildsystem=golang --with=golang --builddirectory=build
   dh_update_autotools_config -O--buildsystem=golang
-O--builddirectory=build
   dh_autoreconf -O--buildsystem=golang -O--builddirectory=build
   debian/rules override_dh_auto_configure
make[1]: Entering directory '/<<PKGBUILDDIR>>'
# grpc_testingv3/testv3.pb.go is not re-generated because it was
# intentionally generated by an older version of protoc-gen-go.
# comments from upstream in code
rm -v -f stress/grpc_testing/metrics.pb.go
health/grpc_health_v1/health.pb.go interop/grpc_testing/test.pb.go
test/codec_perf/perf.pb.go test/grpc_testing/test.pb.go
stats/grpc_testing/test.pb.go reflection/grpc_testing/proto2_ext2.pb.go
reflection/grpc_testing/proto2.pb.go reflection/grpc_testing/test.pb.go
reflection/grpc_testing/proto2_ext.pb.go
reflection/grpc_reflection_v1alpha/reflection.pb.go
benchmark/grpc_testing/payloads.pb.go
benchmark/grpc_testing/messages.pb.go benchmark/grpc_testing/stats.pb.go
benchmark/grpc_testing/services.pb.go
benchmark/grpc_testing/control.pb.go
grpclb/grpc_lb_v1/messages/messages.pb.go
grpclb/grpc_lb_v1/service/service.pb.go
examples/helloworld/helloworld/helloworld.pb.go
examples/route_guide/routeguide/route_guide.pb.go
removed 'stress/grpc_testing/metrics.pb.go'
removed 'health/grpc_health_v1/health.pb.go'
removed 'interop/grpc_testing/test.pb.go'
removed 'test/codec_perf/perf.pb.go'
removed 'test/grpc_testing/test.pb.go'
removed 'stats/grpc_testing/test.pb.go'
removed 'reflection/grpc_testing/proto2_ext2.pb.go'
removed 'reflection/grpc_testing/proto2.pb.go'
removed 'reflection/grpc_testing/test.pb.go'
removed 'reflection/grpc_testing/proto2_ext.pb.go'
removed 'reflection/grpc_reflection_v1alpha/reflection.pb.go'
removed 'benchmark/grpc_testing/payloads.pb.go'
removed 'benchmark/grpc_testing/messages.pb.go'
removed 'benchmark/grpc_testing/stats.pb.go'
removed 'benchmark/grpc_testing/services.pb.go'
removed 'benchmark/grpc_testing/control.pb.go'
removed 'grpclb/grpc_lb_v1/messages/messages.pb.go'
removed 'grpclb/grpc_lb_v1/service/service.pb.go'
removed 'examples/helloworld/helloworld/helloworld.pb.go'
removed 'examples/route_guide/routeguide/route_guide.pb.go'
rm -v -f codes/code_string.go
removed 'codes/code_string.go'
go generate ./...
/sbuild-nonexistent/go/: No such file or directory
grpclb/grpclb_test.go:19: running "protoc": exit status 1
make[1]: *** [debian/rules:21: override_dh_auto_configure] Error 1
make[1]: Leaving directory '/<<PKGBUILDDIR>>'
make: *** [debian/rules:11: build] Error 2
dpkg-buildpackage: error: debian/rules build subprocess returned exit
status 2
--------------------------------------------------------------------------------
Build finished at 2018-05-12T13:52:29Z

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