Update emacsbug and version.el for the Android port

Update emacsbug and version.el for the Android port

* java/Makefile.in (install_temp/assets/version): New generated
file.
* lisp/loadup.el: Set emacs versions appropriately prior to
dumping on Android.
* lisp/mail/emacsbug.el (emacs-build-description): Insert
Android build fingerprint.
* lisp/version.el (emacs-repository-version-android)
(emacs-repository-get-version, emacs-repository-get-branch):
Implement for Android.
* src/androidterm.c (android_set_build_fingerprint): New
function.
(syms_of_androidterm): New variable `android-build-fingerprint'.