To facilitate the is_androidx default to None and skip when type is N…

…one for Android Libraries, marking these used libraries as is_androidx = False

Summary:
This is the precursor to the next diff which will swap the defaults
drop-conflicts

Reviewed By: mkillianey

Differential Revision: D14652399

fbshipit-source-id: 021ff89a1c1f19942ec02414eef0d910a097b63e

core/src/main/java/com/facebook/testing/screenshot/BUCK

@@ -16,6 +16,7 @@ load("//tools/build_defs/oss:screenshot_test_defs.bzl", "SCREENSHOT_TESTS_VISIBI
 fb_core_android_library(
     name = "screenshot",
     srcs = glob(["**/*.java"]),
+    is_androidx = False,
     visibility = SCREENSHOT_TESTS_VISIBILITY,
     deps = [
         "fbandroid//third-party/android/support-new:support-v4",