Update Android port

Update Android port

* build-aux/ndk-build-helper.mk (TARGET_ARCH): Define variable.
* configure.ac (ENABLE_CHECKING, CHECK_STRUCTS)
(GC_CHECK_STRING_OVERRUN, GC_CHECK_STRING_FREE_LIST, GLYPH_DEBUG)
(GC_CHECK_STRING_BYTES): Enable checking correctly on Android.
* java/README: Fix typos.
* m4/ndk-build.m4 (ndk_run_test): Pass target arch.
* src/android.c (android_get_content_name, android_close)
(android_fclose, android_check_string): Fix various typos caught
by checking.
* src/charset.c (load_charset_map_from_file): Call emacs_fclose,
not fclose.
* src/image.c (image_set_transform): Fix thinko.
(png_load_body, jpeg_load_body, gif_load): Call emacs_fclose,
not fclose.  Use open instead of fdopen.
* src/xfaces.c (Fx_load_color_file): Likewise.