PR24393: debuginfod configury: tolerate CXX= configure invocations

Previous code was fragile with respect to this case and needlessly
tolerant with non-c++11 compilers.  New configury makes more muscular
assertion about this, to catch bad $CXX settings or poor language
support.

Signed-off-by: Frank Ch. Eigler <fche@redhat.com>
1 file changed