[4.5, Patch, Fortran] Run-time check for recursion

[Tobias Burnus]

Hi all,

the following adds a run-time check for calling a procedure recursively
without without marking it as RECURSIVE. It relies on Paul's/FX's memory
patch, which add the needed option. (I'm also not documenting it, hoping
that the other patch will also adding the needed documentation.)

Daniel, I hope you have not yet started implementing this, but I needed
yesterday evening something which I could do productively.

Build and tested on x86-64-linux.
(Before check in, one should regtest it again after Paul/FX's patch is in.)
OK for 4.5?

Tobias
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