[Patch, Fortran] PR56735 - Fix namelist read regression with "?"

[Tobias Burnus]

gfortran supports "?" and "=?" as input with namelists (a somewhat 
common vendor extension). Either of those can be used with stdin to 
print the available fields of the namelist. With non-stdin input, the ? 
and =? lines are simply ignored.

However, two patches, one in 2008 and one in 2011 broke that feature. 
The first one broke the output of the namelist with stdin, the second 
caused that the namelist read is aborted (with iostat == 0) - and the 
namelist ist not read.

The attached patch fixes this. GCC 4.6 to 4.9 are affected by the latter 
issue (for which the PR has been filled). The other issue affects 4.5 to 
4.9 and only applies to stdin input, for which no output is shown when 
using "?".

Build and regtested on x86-64-gnu-linux.
OK for the trunk - and for GCC 4.6 to 4.8?

Tobias
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