`delete_cached_binary` didn't work correctly since the cache hash could
be overwritten before the subprocess crashed.
This fix requires an extra memory copy, but it doesn't seem to incur any
measurable overhead.
An alternative could be to store the cache name in its own variable in
ShaderBinaryHeader, but that would break cache files compatibility.
Pull Request: https://projects.blender.org/blender/blender/pulls/143649
5725176312