db_unixodbc: init libssl in a thread

[space88man]

• Commit message has the format required by CONTRIBUTING guide
• Commits are split per component (core, individual modules, libs, utils, ...)
• Each component has a single commit (if not, squash them into one commit)
• No commits to README files for modules (changes must be done to docbook files
  in doc/ subfolder, the README file is autogenerated)

Type Of Change

• Small bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds new functionality)
• Breaking change (fix or feature that would change existing functionality)

Checklist:

• PR should be backported to stable branches
• Tested changes locally
• Related to issue TLS: Recent fixes for for OpenSSL 3.X are causing consistent startup failures when unixodbc is used #3727

Description

The bug report kamailio configuration is using dispatcher + unixodbc and the database driver (tested with MariaDB ODBC, user reports with MS SQL Server(not tested)) inits libssl in rank 0(thread 1).

This PR will init in a thread. This fix is similar to the one done for outbound 4742c81.

[miconda]

I'm fine to merge it if it fixes the related reported issue.