Add -Werror=missing-noreturn (GCC, clang)

May be useful to diagnose functions which fail assertions unconditionally.

Utilities/File.cpp

@@ -230,7 +230,7 @@ namespace fs
 	{
 	}
 
-	stat_t file_base::stat()
+	[[noreturn]] stat_t file_base::stat()
 	{
 		fmt::throw_exception("fs::file::stat() not supported.");
 	}