add bzl_library for pep440 code

Author: rickeylev

python/private/BUILD.bazel

@@ -578,6 +578,11 @@ bzl_library(
     ],
 )
 
+bzl_library(
+    name = "py_wheel_normalize_pep440_bzl",
+    srcs = ["py_wheel_normalize_pep440.bzl"],
+)
+
 bzl_library(
     name = "reexports_bzl",
     srcs = ["reexports.bzl"],