Add bzl_library targets to Gazelle

BUILD.bazel

@@ -1,5 +1,6 @@
 load("@io_bazel_rules_go//go:def.bzl", "nogo")
 load("//:def.bzl", "gazelle", "gazelle_binary")
+load("@bazel_skylib//:bzl_library.bzl", "bzl_library")
 
 # gazelle:prefix github.com/bazelbuild/bazel-gazelle
 # gazelle:exclude vendor
@@ -68,3 +69,15 @@ filegroup(
     ],
     visibility = ["//visibility:public"],
 )
+
+bzl_library(
+    name = "bzl",
+    srcs = [
+        "def.bzl",
+        "deps.bzl",
+    ],
+    deps = [
+        "//internal:bzl",
+        "@bazel_skylib//lib:shell",
+    ],
+)

internal/BUILD.bazel

@@ -1,14 +1,15 @@
 load("@io_bazel_rules_go//go/tools/bazel_testing:def.bzl", "go_bazel_test")
+load("@bazel_skylib//:bzl_library.bzl", "bzl_library")
 
 # gazelle:exclude go_repository_test.go
 go_bazel_test(
     name = "go_repository_test",
     srcs = ["go_repository_test.go"],
-    deps = ["//testtools:go_default_library"],
     rule_files = [
         "@bazel_gazelle//:all_files",
         "@io_bazel_rules_go//:all_files",
     ],
+    deps = ["//testtools:go_default_library"],
 )
 
 # TODO(jayconrod): test fetch_repo error cases.
@@ -44,3 +45,17 @@ filegroup(
     ],
     visibility = ["//visibility:public"],
 )
+
+bzl_library(
+    name = "bzl",
+    srcs = [
+        "gazelle_binary.bzl",
+        "go_repository.bzl",
+        "go_repository_cache.bzl",
+        "go_repository_config.bzl",
+        "go_repository_tools.bzl",
+        "go_repository_tools_srcs.bzl",
+        "overlay_repository.bzl",
+    ],
+    visibility = ["//:__pkg__"],
+)