[Config] Add target generation to macro

[bakpaul]

This branch's purpose is to create artificial targets when compiling to avoid the need of installing sofa to be able to use compiled sofa library in external project compilation.

This was needed by @courtecuisse in the development of external library.

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I have read, understand, and agree SOFA Developer Certificate of Origin (DCO).

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Reviewers will merge this pull-request only if

• it builds with SUCCESS for all platforms on the CI.
• it does not generate new warnings.
• it does not generate new unit test failures.
• it does not generate new scene test failures.
• it does not break API compatibility.
• it is more than 1 week old (or has fast-merge label).