[SofaFramework/CMake] Create configuration type dir before copying lib

[fredroy]

Solve #1331

For multi configuration projects (e.g Visual Studio), the macro was not checking if the directory was existing, and was copying the lib as the configuration name (which is obviously wrong 🐇 )
The fix creates the directory before copying (no need to check as CMake does not do anything if it already exists)

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This PR:

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

Reviewers will merge only if all these checks are true.