Fix xhook cannot hook app_process

Co-authored-by: canyie <31466456+canyie@users.noreply.github.com>
Co-authored-by: John Wu <topjohnwu@gmail.com>

native/jni/external/libxhook/.gitignore

@@ -0,0 +1,18 @@
+.DS_Store
+
+libxhook/libs/
+libxhook/obj/
+libbiz/libs/
+libbiz/obj/
+libtest/libs/
+libtest/obj/
+
+#for xhookwrapper
+build/
+.gradle/
+.idea/
+local.properties
+*.iml
+*.log
+*.so
+xhookwrapper/xhook/libs/