[gfortran] PR libfortran/20006

[FX Coudert]

Attached patch allows the use of the $ edit descriptor as a request for 
non-advancing I/O. It comes with some tests to warn that this is an 
extension, when it is possible at compile-time. Run-time warnings will 
be added once a library warning framework is put in place.

Regtesting nearing completion on i686-linux. OK for mainline and 4.0?

FX
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