Shared

[henderkes]

What does this PR do?

allows building and linking against shared libraries

TODO: building single libraries as shared, rather than all. E.g. to fix mssql issues with static openssl.

Checklist before merging

If your PR involves the changes mentioned below and completed the action, please tick the corresponding option.
If a modification is not involved, please skip it directly.

• If you modified *.php or *.json, run them locally to ensure your changes are valid:
  • composer cs-fix
  • composer analyse
  • composer test
  • bin/spc dev:sort-config
• If it's an extension or dependency update, please ensure the following:
  • Add your test combination to src/globals/test-extensions.php.
  • If adding new or fixing bugs, add commit message containing extension test or test extensions to trigger full test suite.

[henderkes]

Let's drop this instead of adding this feature in a less-than ideal implementation in v2. V3 should have this build int with the easier config definition, spc-config would have to use --static flags depending on what a library wants to be linked as (static or shared).