base64 from coreutils is really picky about the number of equation
marks (=) that end a base64 encoded string. Unfortunately Tor doesn't
believe they are important at all so it cuts them all off all the time.
For perl purposes we just added a good measure of = and were happy about
it. For base64 we now need to add the proper number of equation marks.
It turns out that number is 1 for the length of strings we process.
svn:r18170
