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Fixes (erroneous) warning.

Fixes some warnings.

The old types uint32, uint16 et al have been marked deprecated in
libtiff 4.3.0. Avoid the deprecation warnings while retaining compat.

The Pike.Lazy module acted both as a module and as its deferred
values. The deferred values are now moved to a separate class.

Also adds a cache for lazy values.

Also adds an LFUN::_sprintf() for the lazy values so that they
are easier to identify.

Setting the fd to blocking after it has just been handed over to a new request object is inconsiderate.