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Use GLEW to check if OpenGL 2.1 is supported

--- a/src/Backends/Rendering/OpenGL2.cpp

+++ b/src/Backends/Rendering/OpenGL2.cpp

@@ -102,6 +102,10 @@

 	if (glewInit() != GLEW_OK)

 		return FALSE;

+	// Check if the platform supports OpenGL 2.1

+	if (!GLEW_VERSION_2_1)

+		return FALSE;

+

 	// Check for framebuffer object extension (is part of the core spec in OpenGL 3.0, but not 2.1)

 	if (!GLEW_EXT_framebuffer_object)

 		return FALSE;