SDL: Added android:exported="true" to the example Android manifest

SDL Commits
1 
From 2f591fb0a0f1dbe1d4a0e6477df89c694e9f60f4 Mon Sep 17 00:00:00 2001
From: Sam Lantinga <[EMAIL REDACTED]>
Date: Mon, 15 Nov 2021 12:50:02 -0800
Subject: [PATCH] Added android:exported="true" to the example Android manifest

This is needed for targeting Android 12 (API 31)
---
 android-project/app/src/main/AndroidManifest.xml | 1 +
 1 file changed, 1 insertion(+)

diff --git a/android-project/app/src/main/AndroidManifest.xml b/android-project/app/src/main/AndroidManifest.xml
index ce1c8a9c5d..857253141d 100644
--- a/android-project/app/src/main/AndroidManifest.xml
+++ b/android-project/app/src/main/AndroidManifest.xml
@@ -72,6 +72,7 @@
             android:launchMode="singleInstance"
             android:configChanges="layoutDirection|locale|orientation|uiMode|screenLayout|screenSize|smallestScreenSize|keyboard|keyboardHidden|navigation"
             android:preferMinimalPostProcessing="true"
+            android:exported="true"
             >
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />