[committed] Add missing cleanup in gfortran.dg/fmt_cache_1.f

[Tom de Vries]

Hi,

I found a fort.10 file in the test directories, and using the contents tracked 
it back to fmt_cache_1.f, which creates fort.10 but doesn't remove it. This 
patch fixes that.

Tested by running the test-case and checking that fort.10 doesn't appear anymore 
in the test directory.

Committed as obvious.

Thanks,
- Tom
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