android+test: testcamera needs CAMERA permissions

src/sensor/android/SDL_androidsensor.c

···
 
     while (SDL_AtomicGet(&ctx->running)) {
         Uint64 timestamp = SDL_GetTicksNS();
+        int poll_result;
 
-        if (ALooper_pollAll(-1, NULL, &events, (void **)&source) == LOOPER_ID_USER) {
+        poll_result = ALooper_pollOnce(-1, NULL, &events, (void **)&source);
+        if (poll_result == LOOPER_ID_USER) {
             SDL_LockSensors();
             for (i = 0; i < SDL_sensors_count; ++i) {
                 if (!SDL_sensors[i].event_queue) {

test/android/cmake/AndroidManifest.xml.cmake

···
     <!-- Allow access to the microphone -->
     <uses-permission android:name="android.permission.RECORD_AUDIO" />
 
+    <!-- Allow access to the camera -->
+    <uses-permission android:name="android.permission.CAMERA" />
+    <uses-feature android:name="android.hardware.camera" />
+
     <application
         android:allowBackup="true"
         android:icon="@mipmap/sdl-test"