proxy: cleanup old build file

this is cruft from when we moved the apigroup.

pkg/proxy/BUILD

@@ -26,7 +26,7 @@ filegroup(
     name = "all-srcs",
     srcs = [
         ":package-srcs",
-        "//pkg/proxy/apis:all-srcs",
+        "//pkg/proxy/apis/kubeproxyconfig:all-srcs",
         "//pkg/proxy/config:all-srcs",
         "//pkg/proxy/healthcheck:all-srcs",
         "//pkg/proxy/iptables:all-srcs",

pkg/proxy/apis/BUILD

@@ -1,30 +0,0 @@
-package(default_visibility = ["//visibility:public"])
-
-load(
-    "@io_bazel_rules_go//go:def.bzl",
-    "go_library",
-)
-
-go_library(
-    name = "go_default_library",
-    srcs = [
-        "well_known_annotations.go",
-        "well_known_labels.go",
-    ],
-)
-
-filegroup(
-    name = "package-srcs",
-    srcs = glob(["**"]),
-    tags = ["automanaged"],
-    visibility = ["//visibility:private"],
-)
-
-filegroup(
-    name = "all-srcs",
-    srcs = [
-        ":package-srcs",
-        "//pkg/proxy/apis/kubeproxyconfig:all-srcs",
-    ],
-    tags = ["automanaged"],
-)