* java/AndroidManifest.xml.in: Update targetSdkVersion to 36.
* java/INSTALL: Document revised compilation dependencies.
* java/org/gnu/emacs/EmacsActivity.java (interceptBackGesture):
New function.
(onCreate): Invoke the same to register back gesture callbacks
on Android 16 or better.
* java/org/gnu/emacs/EmacsWindow.java (onBackInvoked): New
function.
* src/keyboard.c (lispy_function_keys): Amend with new symbols
introduced in Android API 36.
