system_properties: Introduce native PropImitationHooks

Allows spoofing first API and security patch level in order to pass
SafetyNet CTS/Play Integrity on build fingerprints newer than 2018.

Inspired by https://github.com/chiteroman/PlayIntegrityFix

Change-Id: If4dd24abe84edcf5e98d27fb5f78ee99f266b4bd
diff --git a/libc/system_properties/Android.bp b/libc/system_properties/Android.bp
index af8bda9..106401c 100644
--- a/libc/system_properties/Android.bp
+++ b/libc/system_properties/Android.bp
@@ -17,6 +17,7 @@
         "contexts_split.cpp",
         "contexts_serialized.cpp",
         "prop_area.cpp",
+        "prop_imitation_hooks.cpp",
         "prop_info.cpp",
         "system_properties.cpp",
     ],