Provide ar_files and as_files for the autoconfigured osx toolchain.

Work on https://github.com/bazelbuild/bazel/issues/8531.

Closes #8544.

PiperOrigin-RevId: 251428636
diff --git a/tools/osx/crosstool/BUILD.tpl b/tools/osx/crosstool/BUILD.tpl
index 4ec81fe..0e3fe23 100644
--- a/tools/osx/crosstool/BUILD.tpl
+++ b/tools/osx/crosstool/BUILD.tpl
@@ -62,8 +62,8 @@
     apple_cc_toolchain(
         name = "cc-compiler-" + arch,
         all_files = ":osx_tools_" + arch,
-        ar_files = ":empty",
-        as_files = ":empty",
+        ar_files = ":osx_tools_" + arch,
+        as_files = ":osx_tools_" + arch,
         compiler_files = ":osx_tools_" + arch,
         dwp_files = ":empty",
         linker_files = ":osx_tools_" + arch,