Query the integer value at key

Property definitions

glesv2 $ GLES :: get_int
	# Query the integer value at `key`
	private fun get_int(key: Int): Int `{
		GLint val;
		glGetIntegerv(key, &val);
		return val;
	`}
lib/glesv2/glesv2.nit:822,2--827,3