checks: move files required by unit tests into tests/files and make sure they're disted
Move unit test data into the directory where it belongs and make in particular the flacdec unit test cd into the directory with the test files instead of making assumptions about the current working directory in that unit test. As a side effect of movng those files, there's only one EXTRA_DIST in tests/check/Makefile.am now, which is likely to work better than having two. Hopefully fixes #582753.
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