[AArch64, testsuite] gfortran.dg/ieee/ieee_8.f90: xfail for aarch64+ilp32

[Charles Baylis]

The test is already marked xfail for aarch64*-*-gnu, but this needs to
be changed to aarch64*-*-gnu* in order to match
aarch64-linux-gnu_ilp32.

Test was previously xfail'd in [1].

Shows the expected FAIL->XFAILs on aarch64-linux-gnu_ilp32.

gcc/testsuite:
<date>  Charles Baylis  <charles.baylis@linaro.org>

        * gfortran.dg/ieee/ieee_8.f90: xfail for aarch64*-*-gnu*

[1] https://gcc.gnu.org/ml/gcc-patches/2016-11/msg02188.html
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