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Join all threads before returning from the test case, to ensure that we don't return from `main` until all open `Device`s have been dropped. This avoids a race condition in glibc in which a thread calling `dlclose` can unmap a shared library's code even while the main thread is still running its finalization functions. (See #5084 for details.) Joining all threads before returning from the test ensures that the Vulkan loader has finished `dlclose`-ing the Vulkan validation layer shared library before `main` returns. Remove `skip` for this test on GL/llvmpipe. With this change, that has not been observed to crash. Without it, the test crashes within ten runs or so. Fixes #5084. Fixed #4285.