[PATCH] Re-enabling another warning

[Aaron Ballman]

This patch fixes a few cases where a default destructor would not be
generated due to a member variable having an inaccessible default
destructor.  While the original code was correct, the updated code is
a bit more clear.  Assuming that this new code is acceptable, this
also re-enables the C4624 MSVC warning (''derived class' : destructor
could not be generated because a base class destructor is
inaccessible').

~Aaron
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