configure: detect that there is no g++

AC_PROG_CXX checks for several C++ compilers INCLUDING g++.  When none
of them were found it sets the CXX variable to be g++.  This doesn't
make any sense.  Absense of g++ has already been made sure.

Because we don't want insanity (that's the whole reason we test the
environment using autoconf), we need to swipe such insane variable out.

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