Do not mix debug prints and stdout data stream

Signed-off-by: David Oberhollenzer <goliath@infraroot.at>

shadermeh.c

@@ -179,7 +179,9 @@ int main(int argc, char **argv)
 
 	glGetIntegerv(GL_MAJOR_VERSION, &major);
 	glGetIntegerv(GL_MINOR_VERSION, &minor);
-	printf("OpenGL version %d.%d\n", major, minor);
+
+	if (!to_stdout)
+		printf("OpenGL version %d.%d\n", major, minor);
 
 	/******************** initialization ********************/
 	glViewport(0, 0, width, height);