[Patch, Fortran] PR56696 - Fix EOF detection for listed-directed real_read

[Tobias Burnus]

This patch fixes the 4.8/4.9 regression, reported by Keith Refson.

The patch which caused the regression (PR55818, Rev. 194809) allowed to 
list-direct read "1<EOF>" as real variable. Seemingly, the handling went 
to far to also affect reading a real from "<EOF>".

I am not completely sure whether the patch is correct, but I think it 
is. I tried character, complex and integer, but those are seemingly not 
affected from the regression.

OK for the trunk and the 4.8 branch?

Tobias
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