[Bug 275431] lang/gcc12: install ISO_Fortran_binding.h in a separate directory

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=275431

            Bug ID: 275431
           Summary: lang/gcc12: install ISO_Fortran_binding.h in a
                    separate directory
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: salvadore@freebsd.org
          Reporter: thierry@FreeBSD.org
          Assignee: salvadore@freebsd.org
             Flags: maintainer-feedback?(salvadore@freebsd.org)

Created attachment 246666
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=246666&action=edit
lang/gcc12: install ISO_Fortran_binding.h in a separate directory

ISO_Fortran_binding.h is sometimes needed for the support of Fortran 2018, e.g.
MPICH must find it to build mpi_f08.mod.

ATM it is installed in a directory depending on $CONFIGURE_TARGET with a
complex path, and it is not possible to point CFLAGS towards this directory
because other headers (like stdatomic.h) would conflict with those from the
system.

Therefore create a new directory /usr/local/include/gcc12 to install this
header.

Secondly introduce a new CFLAGS for ISO_Fortran_binding.h into
Mk/Uses/fortran.mk.

Define CFLAGS_F2018: if needed it will point towards the directory containing
ISO_Fortran_binding. (installed by GCC).

Of course, this patch should be applied too in lang/gcc13 and later, but there
is no hurry.

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