Avoid unportable usage of sscanf(UINT64_FORMAT).

On Mingw, it seems that scanf() doesn't necessarily accept the same format
codes that printf() does, and in particular it may fail to recognize %llu
even though printf() does.  Since configure only probes printf() behavior
while setting up the INT64_FORMAT macros, this means it's unsafe to use
those macros with scanf().  We had only one instance of such a coding
pattern, in contrib/pg_stat_statements, so change that code to avoid
the problem.

Per buildfarm warnings.  Back-patch to 9.0 where the troublesome code
was introduced.

Michael Paquier

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