Zstandard v1.4.8 - hotfix

This is a minor hotfix for v1.4.7,
where an internal buffer unalignment bug was detected by @bmwiedemann .
The issue is of no consequence for x64 and arm64 targets,
but could become a problem for cpus relying on strict alignment, such as mips or older arm designs.
Additionally, some targets, like 32-bit x86 cpus, do not care much about alignment, but the code does, and will detect the misalignment and return an error code. Some other less common platforms, such as s390x, also seem to trigger the same issue.

While it's a minor fix, this update is nonetheless recommended.