Remove unversioned autoconf symlink from all but the latest autoconf. This makes it clearer which autoconf is used.
Add urls to sysc, and modify some tarballs to http (non s) before ssl
Fixes #180
- This is much more standard and replaces /image in sysa and is the standard in sysc (avoids many issues). - GCC needs to have a file created for some unknown reason. - Checksums updated.