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OpenGL: Free VAO and VBO

--- a/src/Backends/Rendering/OpenGL3.cpp

+++ b/src/Backends/Rendering/OpenGL3.cpp

@@ -42,8 +42,9 @@

 static GLint program_colour_fill_uniform_colour;

 static GLint program_glyph_uniform_colour;

-static GLuint framebuffer_id;

+static GLuint vertex_array_id;

 static GLuint vertex_buffer_id;

+static GLuint framebuffer_id;

 static VertexBuffer vertex_buffer;

@@ -205,7 +206,6 @@

 	glClear(GL_COLOR_BUFFER_BIT);

 	// Set up Vertex Array Object

-	GLuint vertex_array_id;

 	glGenVertexArrays(1, &vertex_array_id);

 	glBindVertexArray(vertex_array_id);

@@ -260,6 +260,8 @@

 	glDeleteProgram(program_colour_fill);

 	glDeleteProgram(program_texture_colour_key);

 	glDeleteProgram(program_texture);

+	glDeleteBuffers(1, &vertex_buffer_id);

+	glDeleteVertexArrays(1, &vertex_array_id);

 	SDL_GL_DeleteContext(context);

 }