Implement android_copy_area in C

Implement android_copy_area in C

* java/org/gnu/emacs/EmacsCopyArea.java: Remove file.
* java/org/gnu/emacs/EmacsService.java (EmacsService, copyArea):
Delete function.
* src/android.c (struct android_emacs_service)
(android_init_emacs_service): Remove `copy_area'.
(android_create_gc, android_change_gc, android_get_gc_values):
Record new GC values.
(android_neon_mask_line): New function.
(android_blit_copy, android_blit_xor): New functions.
(android_copy_area): Implement in C.
(android_lock_bitmap): Accept drawables instead of windows.
* src/android.h: Adjust prototype for `android_lock_bitmap'.
* src/androidgui.h (struct android_gc): Record last known GC
values.