Implement cross-directory SAF rename operations

Implement cross-directory SAF rename operations

* java/org/gnu/emacs/EmacsService.java (renameDocument): Don't
catch UnsupportedOperationException; handle ENOSYS in
android_saf_rename_document instead.
(moveDocument): New function.
* lisp/subr.el (y-or-n-p): Always change the text conversion
style.
* src/android.c (android_init_emacs_service)
(android_exception_check_4): New function.
* src/android.h: Update Java function table.
* src/androidvfs.c (android_saf_rename_document): Handle ENOSYS
here by setting errno to EXDEV.
(android_saf_move_document): New function.
(android_document_id_from_name): Take const `dir_name'.
(android_saf_tree_rename): Use delete-move-rename to implement
cross-directory renames.