Set the location for the attribute by name

Property definitions

glesv2 $ GLProgram :: bind_attrib_location
	# Set the location for the attribute by `name`
	fun bind_attrib_location(index: Int, name: String) import String.to_cstring `{
		GLchar *c_name = String_to_cstring(name);
		glBindAttribLocation(self, index, c_name);
	`}
lib/glesv2/glesv2.nit:58,2--62,3