Remove AINPUT_SOURCE_ANY value

In the Android input header file, an enum has a value taking more than
31 bits, leading to the following warning:

    ISO C restricts enumerator values to range of ‘int’

Since we don't use it, remove it.

app/src/android/input.h

@@ -777,9 +777,6 @@ enum android_input_source {
     AINPUT_SOURCE_JOYSTICK = 0x01000000 | AINPUT_SOURCE_CLASS_JOYSTICK,
     /** rotary encoder */
     AINPUT_SOURCE_ROTARY_ENCODER = 0x00400000 | AINPUT_SOURCE_CLASS_NONE,
-
-    /** any */
-    AINPUT_SOURCE_ANY = 0xffffff00,
 };
 
 /**