use carved out module for x/tools/go/vcs (#3671)

This part of golang.org/x/tools was removed from tools.
The vcs code is still available in a separate module with a version marked as "deprecated".
Let's use it for now.

go/private/repositories.bzl

@@ -82,6 +82,25 @@ def go_rules_dependencies(force = False):
         patch_args = ["-p1"],
     )
 
+    # Needed for go/tools/fetch_repo
+    # releaser:upgrade-dep golang tools
+    wrapper(
+        http_archive,
+        name = "org_golang_x_tools_go_vcs",
+        # v0.12.0, latest as of 2023-08-12
+        urls = [
+            "https://mirror.bazel.build/github.com/golang/tools/archive/refs/tags/go/vcs/v0.1.0-deprecated.zip",
+            "https://github.com/golang/tools/archive/refs/tags/go/vcs/v0.1.0-deprecated.zip",
+        ],
+        sha256 = "1b389268d126467105305ae4482df0189cc80a13aaab28d0946192b4ad0737a8",
+        strip_prefix = "tools-go-vcs-v0.1.0-deprecated/go/vcs",
+        patches = [
+            # releaser:patch-cmd gazelle -repo_root . -go_prefix golang.org/x/tools/go/vcs -go_naming_convention import_alias
+            Label("//third_party:org_golang_x_tools_go_vcs-gazelle.patch"),
+        ],
+        patch_args = ["-p1"],
+    )
+
     # releaser:upgrade-dep golang sys
     wrapper(
         http_archive,

go/tools/fetch_repo/BUILD.bazel

@@ -11,13 +11,13 @@ go_library(
     srcs = ["main.go"],
     importpath = "github.com/bazelbuild/rules_go/go/tools/fetch_repo",
     visibility = ["//visibility:private"],
-    deps = ["@org_golang_x_tools//go/vcs:go_default_library"],
+    deps = ["@org_golang_x_tools_go_vcs//:go_default_library"],
 )
 
 go_test(
     name = "go_default_test",
     size = "small",
     srcs = ["fetch_repo_test.go"],
     embed = [":go_default_library"],
-    deps = ["@org_golang_x_tools//go/vcs:go_default_library"],
+    deps = ["@org_golang_x_tools_go_vcs//:go_default_library"],
 )

third_party/org_golang_x_tools_go_vcs-gazelle.patch

@@ -0,0 +1,30 @@
+diff -urN a/BUILD.bazel b/BUILD.bazel
+--- a/BUILD.bazel	1970-01-01 01:00:00.000000000 +0100
++++ b/BUILD.bazel	2023-08-12 19:21:03.606016940 +0200
+@@ -0,0 +1,26 @@
++load("@io_bazel_rules_go//go:def.bzl", "go_library", "go_test")
++
++go_library(
++    name = "vcs",
++    srcs = [
++        "discovery.go",
++        "env.go",
++        "http.go",
++        "vcs.go",
++    ],
++    importpath = "golang.org/x/tools/go/vcs",
++    visibility = ["//visibility:public"],
++    deps = ["@org_golang_x_sys//execabs:go_default_library"],
++)
++
++alias(
++    name = "go_default_library",
++    actual = ":vcs",
++    visibility = ["//visibility:public"],
++)
++
++go_test(
++    name = "vcs_test",
++    srcs = ["vcs_test.go"],
++    embed = [":vcs"],
++)