Tweak import paths of .proto files in errorspb

This makes imports consistent both within this repository as well as in
the main CockroachDB repo. This simplifies the Bazel migration as seen
in cockroachdb/cockroach#57974.

Author: rickystewart

Makefile.update-protos

@@ -33,11 +33,11 @@ all: $(PROTOS)
 	protoc \
 	   -I$$GOPATH/src/ \
 	   -I$$GOPATH/src/github.com \
+	   -I$$GOPATH/src/github.com/cockroachdb/errors \
 	   -I$$GOPATH/src/github.com/gogo/protobuf \
 	   -I$$GOPATH/src/github.com/gogo/protobuf/protobuf \
 	  --gogoroach_out=Mgoogle/protobuf/any.proto=github.com/gogo/protobuf/types,plugins=grpc,import_prefix=:. \
-	  $(PROTOS:%=$(GOPATH)/src/github.com/cockroachdb/errors/%)
-	mv -f github.com/cockroachdb/errors/errorspb/*.pb.go errorspb/
+	  $(PROTOS)
 	$(SED) $(SED_INPLACE) -E \
 		-e '/import _ /d' \
 		-e 's!import (fmt|math) "github.com/(fmt|math)"! !g' \

errorspb/errors.pb.go

@@ -2,7 +2,7 @@ syntax = "proto3";
 package cockroach.errorspb;
 option go_package = "errorspb";
 
-import "github.com/cockroachdb/errors/errorspb/errors.proto";
+import "errorspb/errors.proto";
 import "gogoproto/gogo.proto";
 
 // MarkPayload is the error payload for a forced marker.