systemlibs: unbundle astunparse

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

third_party/systemlibs/astunparse.BUILD

@@ -0,0 +1,15 @@
+# Description:
+#   AST round-trip manipulation for Python.
+
+licenses(["notice"])
+
+py_library(
+    name = "astunparse",
+    visibility = ["//visibility:public"],
+)
+
+filegroup(
+    name = "LICENSE",
+    visibility = ["//visibility:public"],
+)
+

third_party/systemlibs/syslibs_configure.bzl

@@ -11,6 +11,7 @@ _TF_SYSTEM_LIBS = "TF_SYSTEM_LIBS"
 VALID_LIBS = [
     "absl_py",
     "astor_archive",
+    "astunparse_archive",
     "boringssl",
     "com_github_googleapis_googleapis",
     "com_github_googlecloudplatform_google_cloud_cpp",