Support both sdl3 and sdl2 in android recipe

Author: misl6

pythonforandroid/recipes/android/__init__.py

@@ -73,7 +73,12 @@ def prebuild_arch(self, arch):
                 ))
                 self.config_env[key] = str(value)
 
-            if is_sdl:
+            if bootstrap_name == "sdl2":
+                fh.write('JNIEnv *SDL_AndroidGetJNIEnv(void);\n')
+                fh.write(
+                    '#define SDL_ANDROID_GetJNIEnv SDL_AndroidGetJNIEnv\n'
+                )
+            elif bootstrap_name == "sdl3":
                 fh.write('JNIEnv *SDL_GetAndroidJNIEnv(void);\n')
                 fh.write(
                     '#define SDL_ANDROID_GetJNIEnv SDL_GetAndroidJNIEnv\n'