Since we're using gcc 4.4 in master, we can use the -Werror= option
to make not having a virtual destructor in classes with virtual
methods an error. I already fixed all code that had this problem,
so now it's a matter of turning the option on.
Also, as long as we don't have any C-specific options, it's
probably best to copy the CPP flags from the C flags. We can
always break them out later.
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