Don't forcibly display dialogs on Android if a keyboard is present

Don't forcibly display dialogs on Android if a keyboard is present

* java/org/gnu/emacs/EmacsService.java (detectKeyboard): New
function.

* lisp/subr.el (use-dialog-box-p): Don't always return t if a
keyboard is present on Android.

* src/android.c (android_init_emacs_service): Link to new
function.
(android_detect_keyboard): New function.

* src/android.h: Update prototypes.

* src/androidfns.c (Fandroid_detect_keyboard)
(syms_of_androidfns): New function.

(cherry picked from commit 0d2b7120783255fbb0f8e98717573c35425f4df6)