Attached is the updated patch against 1.0.41 release. This takes care of the following.

Explicitly include stdint header as logic uses INT[64]_MAX, just
in case for future, even though the chain of headers from existing
includes brings in the definition indirectly as of now.

Cross check for time gap between prngplus reseeding, periodically,
has the internal state is being consumed, so that if there is too
much time gap, then prng reseeding can be forced, before the normal
reseed window is reached. This is useful for long running programs
which trigger dns queries only intermittently.

If clock_gettime is not available, then reseed more frequently, by
default. A platform developer may change the reseed frequence, to
be bit more less often in this case, if needed, by tweaking the
defines in the source.
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