fix build mail/mimetic on aarch64 and armv7

Fixes the signed/unsigned char problem. Patch tested on amd64, all tests passed on all three archs: Index: patches/patch-mimetic_codec_base64_cxx === RCS file: patches/patch-mimetic_codec_base64_cxx diff -N patches/patch-mimetic_code

Re: fix build mail/mimetic on aarch64 and armv7

On Sun, May 27 2018, Markus Hennecke wrote: > Fixes the signed/unsigned char problem. Patch tested on amd64, all tests > passed on all three archs: Committed, thanks. I added a REVISION bump just to be safe; powerpc also uses unsigned char, but doesn't use clang. > Index: patches/patch-mimetic