update BUILD files

vendor/github.com/prometheus/common/expfmt/BUILD

@@ -9,6 +9,7 @@ go_library(
         "text_create.go",
         "text_parse.go",
     ],
+    importpath = "github.com/prometheus/common/expfmt",
     visibility = ["//visibility:public"],
     deps = [
         "//vendor/github.com/golang/protobuf/proto:go_default_library",

vendor/github.com/prometheus/common/internal/bitbucket.org/ww/goautoneg/BUILD

@@ -3,6 +3,7 @@ load("@io_bazel_rules_go//go:def.bzl", "go_library")
 go_library(
     name = "go_default_library",
     srcs = ["autoneg.go"],
+    importpath = "github.com/prometheus/common/internal/bitbucket.org/ww/goautoneg",
     visibility = ["//vendor/github.com/prometheus/common:__subpackages__"],
 )
 

vendor/github.com/prometheus/common/model/BUILD

@@ -15,6 +15,7 @@ go_library(
         "time.go",
         "value.go",
     ],
+    importpath = "github.com/prometheus/common/model",
     visibility = ["//visibility:public"],
 )