> Extra:  gfortran.8 pthread.27 python3.12.0 quadmath.3

These come from the python and fortran modules (and pthread may be
extra but it will come back with COMPILER_LIBCXX anyway). Harmless.

> WANTLIB += ${COMPILER_LIBCXX}

This should be added. Previously we had COMPILER_LANGS=c but that broke
some configure tests. numpy 2 now actually uses C++, so it will need
that.