CXXFLAGS example in share/examples/etc/make.conf should to be updated

[Alexander Best]

hi there,

would it be possible to update the CXXFLAGS example in
share/examples/etc/make.conf?

looking at the gcc(1) man page, -fconserve-space seems to be a bad example.
can somebody thing of a C++ specific option which makes more sense?

or maybe something like -Weffc++? although idealy this should go into the
(non-existing) CXXWARNSFLAGS.

cheers.
alex