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Make configure.com ready for C++.
Building on Peter Prymmer's work from some years ago, this gets
the configuration process on VMS up to speed on the native C++
compiler. Quite a bit of it involves tweaking the configuration
probes to work under C++, plus a variety of other nits.
TODO: This should probably be made to work as -Dcc=cxx rather
than -Dusecxx as it does now, but it's still pretty experimental.