Complete pacification of build warnings on Android

Complete pacification of build warnings on Android

* build-aux/makecounter.sh: Introduce extern declaration of
emacs_shortlisp_counter.

* src/android.c (android_class_path): Declare static.

* src/androidfont.c (font_driver_class, font_spec_class)
(integer_class, font_metrics_class, font_object_class): Declare
static.

* src/androidterm.c (android_frame_parm_handlers): Move
declaration...

* src/androidterm.h (android_frame_parm_handlers): ... here.