[testsuite, fortran] Compile gfortran.dg/bessel_[67].f90 with -mieee

[Tobias Burnus]

Regarding Bessel_6: I have committed the attached patch.

Rainer Orth wrote:
> What about the following patch that fixes at least bessel_7.f90?
>
> Tested with the appropriate runtest invocations on the 4.6 branch
> (couldn't test mainline since bootstrap was broken there).
>
> Ok for mainline, 4.6 and 4.5 branches once tested?

OK.

> I've also had a look at the other gfortran testsuite failures on Tru64
> UNIX V5.1B and IRIX 6.5 that couldn't be fixed that easily.
> How to best report them and have them investigated?  I suspect that
> there might be only a few common issues, so a PR per failing testcase
> might be overkill, while a single one for all failures is hard to deal with.

No idea. I would go for only one or few PRs, one can still extend it to 
several. Maybe one could also restrict one to few issues as a starter.

Tobias
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