m/n/c/abloader: fix duplicate build

Previously, the abloader was built twice with different
@io_bazel_rules_go//go/config:static setting.

Change-Id: I41ebac22613b895fe85f14367bdf0f31c817cafe
Reviewed-on: https://review.monogon.dev/c/monogon/+/4163
Tested-by: Jenkins CI
Reviewed-by: Tim Windelschmidt <tim@monogon.tech>
diff --git a/metropolis/node/core/abloader/BUILD.bazel b/metropolis/node/core/abloader/BUILD.bazel
index ee7b69f..de47b00 100644
--- a/metropolis/node/core/abloader/BUILD.bazel
+++ b/metropolis/node/core/abloader/BUILD.bazel
@@ -1,14 +1,15 @@
 load("@rules_rust//rust:defs.bzl", "rust_binary")
+load("//osbase/build:def.bzl", "ignore_unused_configuration_target")
 
 rust_binary(
-    name = "abloader",
+    name = "abloader_bin",
     srcs = ["main.rs"],
     edition = "2021",
     platform = "//build/platforms:efi_amd64",
     target_compatible_with = [
         "@platforms//os:uefi",
     ],
-    visibility = ["//visibility:public"],
+    visibility = ["//visibility:private"],
     deps = [
         "//metropolis/node/core/abloader/spec:abloader_proto_rs",
         "@crate_index_efi//:prost",
@@ -16,3 +17,9 @@
         "@crate_index_efi//:uefi-services",
     ],
 )
+
+ignore_unused_configuration_target(
+    name = "abloader",
+    dep = ":abloader_bin",
+    visibility = ["//visibility:public"],
+)