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test_vfstrace.c missing wrappers for xFetch() and xUnfetch()
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Really minor point for a rainy day, but test_vfstrace.c is missing wrappers for xFetch and xUnfetch.

When using this in WAL mode, it caused a segfault as these functions could be called (xUnfetch in my test), but are not initialised in the sqlite3_io_methods structure.