Improve pg_dump's checkSeek() function to verify the functioning of ftello
as well as fseeko, and to not assume that fseeko(fp, 0, SEEK_CUR) proves anything. Also improve some related comments. Per my observation that the SEEK_CUR test didn't actually work on some platforms, and subsequent discussion with Robert Haas. Back-patch to 8.4. In earlier releases it's not that important whether we get the hasSeek test right, but with parallel restore it matters.
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