systemlibs: unbundle functools32

Signed-off-by: Jason Zaman <jason@perfinion.com>

tensorflow/workspace.bzl

@@ -324,6 +324,7 @@ def tf_repositories(path_prefix = "", tf_repo_name = ""):
         build_file = clean_dep("//third_party:functools32.BUILD"),
         sha256 = "f6253dfbe0538ad2e387bd8fdfd9293c925d63553f5813c4e587745416501e6d",
         strip_prefix = "functools32-3.2.3-2",
+        system_build_file = clean_dep("//third_party/systemlibs:functools32.BUILD"),
         urls = [
             "https://storage.googleapis.com/mirror.tensorflow.org/pypi.python.org/packages/c5/60/6ac26ad05857c601308d8fb9e87fa36d0ebf889423f47c3502ef034365db/functools32-3.2.3-2.tar.gz",
             "https://pypi.python.org/packages/c5/60/6ac26ad05857c601308d8fb9e87fa36d0ebf889423f47c3502ef034365db/functools32-3.2.3-2.tar.gz",

third_party/systemlibs/functools32.BUILD

@@ -0,0 +1,15 @@
+# Description:
+#   functools32 provides a backport of the functools module for Python 2.
+
+licenses(["notice"])  # Python 2.0
+
+package(default_visibility = ["//visibility:public"])
+
+filegroup(
+    name = "LICENSE",
+)
+
+py_library(
+    name = "functools32",
+    srcs_version = "PY2AND3",
+)

third_party/systemlibs/syslibs_configure.bzl

@@ -21,6 +21,7 @@ VALID_LIBS = [
     "double_conversion",
     "enum34_archive",
     "flatbuffers",
+    "functools32_archive",
     "gast_archive",
     "gif_archive",
     "grpc",