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MDEV-32820 Race condition between trx_purge_free_segment() and trx_un…
…do_create() trx_purge_free_segment(): If fseg_free_step_not_header() needs to be called multiple times, acquire an exclusive latch on the rollback segment header page after restarting the mini-transaction so that the rest of this function cannot execute concurrently with trx_undo_create() on the same rollback segment. This fixes a regression that was introduced in commit c14a394 (MDEV-30753). Note: The buffer-fixes that we are holding across the mini-transaction restart will prevent the pages from being evicted from the buffer pool. They may be accessed by other threads or written back to data files while we are not holding exclusive latches. Reviewed by: Vladislav Lesin
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