Input: auto-select INPUT for MAC_EMUMOUSEBTN option

Otherwise we'll ge the following build error:

  LD      .tmp_vmlinux1
drivers/built-in.o: In function `input_report_key':
include/linux/input.h:1158: undefined reference to `input_event'
    ...
Signed-off-by: Andreas Herrmann <aherrman@arcor.de>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

drivers/macintosh/Kconfig

@@ -167,6 +167,7 @@ config INPUT_ADBHID
 
 config MAC_EMUMOUSEBTN
 	bool "Support for mouse button 2+3 emulation"
+	select INPUT
 	help
 	  This provides generic support for emulating the 2nd and 3rd mouse
 	  button with keypresses.  If you say Y here, the emulation is still