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Release backend on teardown

Olivier Fourdan requested to merge ofourdan/mutter:deinit-backend into master

Mutter still relies heavily on singletons such as its MetaBackend.

For that, the backend implementation has a meta_init_backend() function which is called at startup from meta_init(), which creates the desired backend and sets the singleton which is returned by meta_get_backend().

Unfortunately, that means that the backend is never actually freed, and all the code from the backend finalize function never actually get called.

This MR aimed a fixing this (without removing the use of singletons).

Edited by Olivier Fourdan

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