Update Android port

Update Android port

* doc/emacs/android.texi (Android File System): Document what
`temp~unlinked' means in the temporary files directory.
* java/org/gnu/emacs/EmacsService.java (updateExtractedText):
New function.
* java/org/gnu/emacs/EmacsView.java (onCreateInputConnection):
Ask the input method nicely to not display the extracted text
UI.
* src/android.c (struct android_emacs_service): New method
`updateExtractedText'.
(android_hack_asset_fd_fallback): Improve naming convention.
Fix typo.
(android_init_emacs_service): Add new method.
(android_update_extracted_text): New function.
(android_open_asset): Fix typo.
* src/androidgui.h: Update prototypes.
* src/androidterm.c (struct android_get_extracted_text_context):
New field `flags'.
(android_get_extracted_text): Set flags on the frame's output
data.
(android_build_extracted_text): New function.
(getExtractedText): Move out class structures.
(android_update_selection): Send updates to extracted text if
the input method asked for them.
(android_reset_conversion): Clear extracted text flags.
* src/androidterm.h (struct android_output): New fields for
storing extracted text data.