Wrap Android repositories with maybe().

This is so that they can be overridden from the main WORKSPACE file e.g. when one wants to vendor them.

RELNOTES: None.
PiperOrigin-RevId: 450690963
diff --git a/src/main/java/com/google/devtools/build/lib/bazel/rules/android/android_remote_tools.WORKSPACE b/src/main/java/com/google/devtools/build/lib/bazel/rules/android/android_remote_tools.WORKSPACE
index 634fc08..7346f0e 100644
--- a/src/main/java/com/google/devtools/build/lib/bazel/rules/android/android_remote_tools.WORKSPACE
+++ b/src/main/java/com/google/devtools/build/lib/bazel/rules/android/android_remote_tools.WORKSPACE
@@ -1,14 +1,17 @@
 load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive", "http_jar")
+load("@bazel_tools//tools/build_defs/repo:utils.bzl", "maybe")
 
 # This must be kept in sync with the top-level WORKSPACE file.
-http_archive(
+maybe(
+    http_archive,
     name = "android_tools",
     sha256 = "5aba10f2381bd4699313879336e038f9fa09e8180cd5a98d3c0ae40a13082549",
     url = "https://mirror.bazel.build/bazel_android_tools/android_tools_pkg-0.24.0.tar.gz",
 )
 
 # This must be kept in sync with the top-level WORKSPACE file.
-http_jar(
+maybe(
+    http_jar,
     name = "android_gmaven_r8",
     sha256 = "8626ca32fb47aba7fddd2c897615e2e8ffcdb4d4b213572a2aefb3f838f01972",
     url = "https://maven.google.com/com/android/tools/r8/3.3.28/r8-3.3.28.jar",