[patch testsuite]: Deactivate some test in gfortran.dg not supported by w64

[Tobias Burnus]

Kai Tietz wrote:
> Hello,
>
> The following testcases in gfortran.dg are using the chmod call, which has 
> not the same options on w64 as for unix platforms and should be disabled 
> for this target.
>
> 2008-04-30  Kai Tietz  <kai.tietz@onevision.com>
>
>         * gfortran.dg/chmod_1.f90: Disable for x86_64-*-mingw*.
>         * gfortran.dg/chmod_2.f90: Likewise.
>         * gfortran.dg/chmod_3.f90: Likewise.
>         * gfortran.dg/open_errors.f90: Likewise.
>
> Is this patch ok for apply?
>   
OK, I think this qualifies as obious. (Still, I wonder whether one 
should put parts of open_errors.f90 into a different file and make them 
thus testable with mingw. )

Tobias