Style: Replace header guards with #pragma once

platform/android/file_access_filesystem_jandroid.h

@@ -28,8 +28,7 @@
 /* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                 */
 /**************************************************************************/
 
-#ifndef FILE_ACCESS_FILESYSTEM_JANDROID_H
-#define FILE_ACCESS_FILESYSTEM_JANDROID_H
+#pragma once
 
 #include "java_godot_lib_jni.h"
 
@@ -105,5 +104,3 @@ public:
 	FileAccessFilesystemJAndroid();
 	~FileAccessFilesystemJAndroid();
 };
-
-#endif // FILE_ACCESS_FILESYSTEM_JANDROID_H