Improve native rocksdb dependencies loading

[flcl42]

Fixes #4039

If Nethermind is downloaded from sources, it's easy to forget to make a library link that fixes RocksDb native dependency loading

Changes:

• Load libdl.so.2 if libdl.so was not found

Types of changes

What types of changes does your code introduce?
Put an x in the boxes that apply

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Update
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Other (please describe):

Testing

Requires testing

• Yes
• No

In case you checked yes, did you write tests??

• Yes
• No

Manual tests

• The client runs and shutdowns without problems on fresh linux installation after being downloaded as an archive/installed as a ppa package and in any other case too

[LukaszRozmej]

just make it static in static constructor.

[FalcoXYZ]

LGTM!
Tested on Ubuntu 22 arm64, works without the symlink command.