Update free-programming-books-pl.md

Added link to opengl course in c++ (http://cpp0x.pl/kursy/Kurs-OpenGL-C++/)
11 years ago · 4fd8cbbece
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 * [Kurs C++](http://cpp0x.pl/kursy/Kurs-C++/1)
 * [Zaawansowane C++](http://wazniak.mimuw.edu.pl/index.php?title=Zaawansowane_CPP)
+* [OpenGL w C++](http://cpp0x.pl/kursy/Kurs-OpenGL-C++/)

 ###Common Lisp