Fix Python for 'archive_desugar_jdk_libs.py'

Bug: b/266903708
Change-Id: Idb15c4b8791e78f343071a5a3affbe00f81cd10f
diff --git a/tools/archive_desugar_jdk_libs.py b/tools/archive_desugar_jdk_libs.py
index 6f073eb..931fe23 100755
--- a/tools/archive_desugar_jdk_libs.py
+++ b/tools/archive_desugar_jdk_libs.py
@@ -174,7 +174,7 @@
   if variant != 'jdk8':
     # Hack to workaround b/256723819.
     os.remove(
-      join(
+      os.path.join(
         checkout_dir,
         "jdk11",
         "src",