More print/poppler troubles: print/web2c

["Sijmen J. Mulder" <ik%sjmulder.nl@localhost>]

Hi,

After fixing the print/poppler build on RHEL 7 by setting GCC_REQD=5
so the C++14 sources could be compiled, GCC 4.8-built print/web2c is
failing because it can't link against the GCC 5 libpoppler.so.

  libpoppler.so: undefined reference to `std::__cxx11::basic_string<...

...and so on.

One could set GCC_REQD=5 in web2c but where does that rabbit hole end?
The core of the issue is that you can't really pick C++ compilers on a
per-package basis.

Sijmen