[Patch, fortran] A first small step towards CFI descriptor implementation

[Paul Richard Thomas]

Daniel Celis Garza and Damian Rouson have developed a runtime library
and include file for the TS 29113 and F2018 C descriptors.
https://github.com/sourceryinstitute/ISO_Fortran_binding

The ordering of types is different to the current 'bt' enum in
libgfortran.h. This patch interchanges BT_DERIVED and BT_CHARACTER to
fix this.

Regtests on FC28/x86_64. OK for trunk?

Cheers

Paul

2018-07-31  Paul Thomas  <pault@gcc.gnu.org>

    * gcc/fortran/libgfortran.h : In bt enum interchange BT_DERIVED
    and BT_CHARACTER for CFI descriptor compatibility(TS 29113).
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