Pointers set but then (immediately or very shortly) overwritten.

Fix for Coverity perl5 CIDs 29203, 29207, 29211, 29214, 29217, 29218,
29222: Unused pointer value (UNUSED_VALUE) Pointer foo returned by
bar() is overwritten.
bump $XS::APItest::VERSION to 0.61
remove comment that no longer applies