Bazel BUILD fixes

vendor/github.com/golang/protobuf/protoc-gen-go/descriptor/BUILD

@@ -0,0 +1,29 @@
+load("@io_bazel_rules_go//go:def.bzl", "go_library")
+
+filegroup(
+    name = "go_default_library_protos",
+    srcs = ["descriptor.proto"],
+    visibility = ["//visibility:public"],
+)
+
+go_library(
+    name = "go_default_library",
+    srcs = ["descriptor.pb.go"],
+    importpath = "github.com/golang/protobuf/protoc-gen-go/descriptor",
+    visibility = ["//visibility:public"],
+    deps = ["//vendor/github.com/golang/protobuf/proto:go_default_library"],
+)
+
+filegroup(
+    name = "package-srcs",
+    srcs = glob(["**"]),
+    tags = ["automanaged"],
+    visibility = ["//visibility:private"],
+)
+
+filegroup(
+    name = "all-srcs",
+    srcs = [":package-srcs"],
+    tags = ["automanaged"],
+    visibility = ["//visibility:public"],
+)