[RFC] Fortran search path for intrinsic includes and modules

[François-Xavier Coudert]

> Go with ${PREFIX}/finclude unless pbrook objects.

I'm not sure this is indeed a good thing in the case where
PREFIX=/usr. Distros will probably be reluctant to have a new
subdirectory in /usr that contains only a few files. I'd really rather
see it go into the ${PREFIX}/lib/... Plus, we have to consider whether
these files are target-dependent or not. If they are, then they should
go somewhere labelled with the target triplet (like object files go
into /usr/lib/gcc/${target-triplet}/${version}/), shouldn't they?

FX