fix for unneeded data conversion & wrong data type in mir_base64_encode

git-svn-id: http://svn.miranda-ng.org/main/trunk@7857 1316c22d-e87f-b044-9b9b-93d7a3e3ba9c
oops... forgotten that shitty pascal still cannot export variables

git-svn-id: http://svn.miranda-ng.org/main/trunk@7858 1316c22d-e87f-b044-9b9b-93d7a3e3ba9c