Avoid caching file status when they are about to change

Avoid caching file status when they are about to change

* java/org/gnu/emacs/EmacsSafThread.java (EmacsSafThread)
(cacheFileStatus): New argument NO_CACHE.
(cacheDirectoryFromCursor, statDocument1):
* java/org/gnu/emacs/EmacsService.java (EmacsService)
(statDocument): Plumb that argument through each of these wrapper
functions.
* src/android.c (android_init_emacs_service): Adjust JNI
function signatures to agree with statDocument1.
* src/androidvfs.c (android_saf_stat): Plumb that argument
through here.
(android_saf_tree_stat, android_saf_file_open): And don't cache
file status if a write is imminent.