fix: add the windows *.lib interface file to the python_headers l…

…ibrary

A user might use `python_headers` to build an extension module that does
not itself pull in the python shared library. On Windows, this needs to
expose the `*.lib` interface file to compile correctly.

python/repositories.bzl

@@ -246,13 +246,23 @@ filegroup(
     ),
 )
 
+cc_import(
+    name = "interface",
+    interface_library = "libs/python{python_version_nodot}.lib",
+    system_provided = True,
+)
+
 filegroup(
     name = "includes",
     srcs = glob(["include/**/*.h"]),
 )
 
 cc_library(
     name = "python_headers",
+    deps = select({{
+        "@bazel_tools//src/conditions:windows": [":interface"],
+        "//conditions:default": None,
+    }}),
     hdrs = [":includes"],
     includes = [
         "include",