SDL: Android: fixes build NDK 21d

SDL Commits
1 
From d0de4c625ad26ef5401665ca26b5f2c0fb76e91b Mon Sep 17 00:00:00 2001
From: e <[EMAIL REDACTED]>
Date: Fri, 31 Dec 2021 14:36:32 -0300
Subject: [PATCH] Android: fixes build NDK 21d

---
 src/audio/aaudio/SDL_aaudio.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/audio/aaudio/SDL_aaudio.h b/src/audio/aaudio/SDL_aaudio.h
index 2b16fb1ae21..494e8271db3 100644
--- a/src/audio/aaudio/SDL_aaudio.h
+++ b/src/audio/aaudio/SDL_aaudio.h
@@ -24,6 +24,7 @@
 #define _SDL_aaudio_h
 
 #include "../SDL_sysaudio.h"
+#include <stdbool.h>
 #include <aaudio/AAudio.h>
 
 /* Hidden "this" pointer for the audio functions */