aux/android: Remove unused header file

src/xrt/auxiliary/android/android_looper.c

@@ -21,6 +21,7 @@ android_looper_poll_until_activity_resumed()
 	// Can we assume that activity already resumed if polling is failed?
 	while (ALooper_pollAll(-1, NULL, NULL, (void **)&source) == LOOPER_ID_MAIN) {
 		if (source) {
+			// Let callback owner handle the event
 			source->process(source->app, source);
 			if (source->app->activityState == APP_CMD_RESUME && source->app->window) {
 				U_LOG_I("Activity is in resume state and window is ready now");

src/xrt/auxiliary/android/android_looper.h

@@ -11,8 +11,6 @@
 
 #ifdef XRT_OS_ANDROID
 
-#include <cstdbool>
-
 #ifdef __cplusplus
 extern "C" {
 #endif