[patch gfortran testsuite] Fix some dg-output in the testsuite

[Dominique Dhumieres]

> I committed all except

Thanks

> except unf_io_convert_3.f90 for which I have filed a bug report
> pr31915.  That test fails for me on x86-64.  I wonder if it ever worked since it
> also fails on 4.1 and 4.2.

I'ld say that not only the test never worked, but was probably broken on purpose.
Unfortunately the why has not been documented so I don't know if it is because of
the implementation of the dg-output directive at the time of the submission or
because the bug you saw was already lurking at that time.

Dominique