Write the byte value

Property definitions

libevent $ NativeBufferEvent :: write_byte
	# Write the byte `value`
	fun write_byte(value: Int): Int `{
		unsigned char byt = (unsigned char)value;
		return bufferevent_write(self, &byt, 1);
	`}
lib/libevent/libevent.nit:369,2--373,3