Update bzl_library targets

With bazel-contrib/bazel-gazelle#760 submitted, it
should now be possible to use stardoc to generate documentation for
rules_go and gazelle.

go/platform/BUILD.bazel

@@ -36,3 +36,8 @@ bzl_library(
     name = "apple",
     srcs = ["apple.bzl"],
 )
+
+bzl_library(
+    name = "crosstool",
+    srcs = ["crosstool.bzl"],
+)

go/private/BUILD.bazel

@@ -137,3 +137,9 @@ bzl_library(
         "//proto:__pkg__",  # keep
     ],
 )
+
+bzl_library(
+    name = "rpath",
+    srcs = ["rpath.bzl"],
+    visibility = ["//go:__subpackages__"],
+)

go/private/actions/BUILD.bazel

@@ -75,8 +75,10 @@ bzl_library(
     srcs = ["link.bzl"],
     visibility = ["//go:__subpackages__"],
     deps = [
+	"@bazel_skylib//lib:collections",
         "@io_bazel_rules_go//go/private:common",
         "@io_bazel_rules_go//go/private:mode",
+        "@io_bazel_rules_go//go/private:rpath",
     ],
 )
 

go/private/repositories.bzl

@@ -316,6 +316,7 @@ load("@bazel_skylib//:bzl_library.bzl", "bzl_library")
 bzl_library(
     name = "def",
     srcs = ["def.bzl"],
+    visibility = ["//visibility:public"],
 )
 """
     ctx.file("BUILD.bazel", build_content)

go/private/rules/BUILD.bazel

@@ -115,12 +115,13 @@ bzl_library(
         "//go:__subpackages__",
         "//proto:__pkg__",
     ],
-    # Don't list dependency on @io_bazel_rules_go_name_hack//:def
     deps = [
+	"@io_bazel_rules_go_name_hack//:def",
+	"@io_bazel_rules_go//go/platform:crosstool",
         "@io_bazel_rules_go//go/private:mode",
         "@io_bazel_rules_go//go/private:platforms",
         "@io_bazel_rules_go//go/private:providers",
-    ],  # keep
+    ],
 )
 
 bzl_library(