Failure to compile 8.0 on CentoOS 6.6 without g++ installed

[Marcus Comstedt (ACROSS) (Hail Ilpalazzo!) @ Pike (-) developers forum]

I'd rather suspect AC_PROG_CXX, which was added in this commit:

commit bf4cdfefc4574f2bc59463022578d758bbd29e11
Author: Henrik Grubbström (Grubba) <gru...@grubba.org>
Date:   Mon Feb 14 13:42:35 2011 +0100

    Improved support for modules needing C++ compilers.