Copying & patching all the DSOs is a time consuming process (~10s on a
slow hard drive computer). We definitely don't want to go through it
for each process start, we need to introduce a cache.
For this cache, we go the concervative way. We're going to "resolve" a
DSO name (ie. find the DSO absolute path) and sha256-hash each DSO.
We're then going to compare the fingerprints to determine whether or
not we need to nuke and rebuild the DSO cache.
The cache state is persisted through a JSON file saved in the cache dir.
