Contrib a MacOSX-buildable Lmod/5.8 (and not only)

Get ready for Lmod/5.8, installable on recent macosx variants (implies a tiny patch)
no imports in easyconfigs please

also: it's OK to always include this patch file, since it doesn't affect other systems

but then include the patch in *all* ncurses easyconfigs, and version the patch file: `ncurses-5.9_configure-darwin.patch`