[ANN] lbase64 update

[Luiz Henrique de Figueiredo <lhf@...>]

I have updated my lbase64 package with a new Makefile
	http://www.tecgraf.puc-rio.br/~lhf/ftp/lua/#lbase64

Checksum and other data available at
       http://www.tecgraf.puc-rio.br/~lhf/ftp/lua/release.txt

Like all my code, lbase64 is in the public domain.
Enjoy. All feedback welcome.
--lhf