[v3] Remove uses of <cstddef> as an implementation detail

[Jason Merrill]

After this patch testsuite_abi.cc no longer builds on glibc 2.8 and 
earlier systems (such as gcc14), because of

   http://sources.redhat.com/bugzilla/show_bug.cgi?id=9694

causing ptrdiff_t to never get defined.  This patch (to include stddef 
early rather than wait until cxxabi.h brings it in) works around the 
glibc bug.  What do you think?

Jason

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