fischertechnik building block with rivet (Riegelbaustein 15)

A variant of the [S-Riegelstein 15x15](https://ft-datenbank.de/ticket/4015?highlight=Riegelstein) for the [fischertechnik](https://www.fischertechnik.de/en) construction toy system with an additional groove at its back (S-Riegelbaustein 15). Inspired by an idea from [this thread](https://forum.ftcommunity.de/viewtopic.php?f=4&t=3082&start=100#p35887) in the fischertechnik community.

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