[Patch, Fortran] PR40569/40568: Support intrinsic module procedures (F2008)

[Tobias Burnus]

  This patch add support for compiler_version and compiler_options, 
which are part of F2008's ISO_FORTRAN_ENV. It also moves c_sizeof into 
the module ISO_C_BINDINGS where it belongs to (before it was a normal 
intrinsic).

TODO:
a) With -Wall I get the warning that the intrinsic is already typed.
b) compiler_options returns an empty string.

I plan to look into those issues as once as the patch is in.

Build and currently regtesting on x86-64-linux.
OK for the trunk?

Tobias
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