[PATCH, testsuite]: Disable gcc.dg/pr61441 where issignaling is not available

[Jeff Law]

On 01/14/2016 07:45 AM, Uros Bizjak wrote:
> 2016-01-14  Uros Bizjak  <ubizjak@gmail.com>
>
>      * lib/target-supports.exp (check_effective_target_issignaling):
>      New procedure.
>      * gcc.dg/pr61441.c: Require issignaling effective target.
>
> Tested on x86_64-linux-gnu, CentOS 5.11 and Fedora 23.
>
> OK for mainline?
OK.
jeff