[patch, testsuite] skip broken test on Windows

[Sandra Loosemore]

This patch is a followup to PR23153, in which it was reported that gas's 
inode comparison test for identical input and output files doesn't work 
on MinGW hosts, so it was disabled.  Now the test case that is supposed 
to verify that a diagnostic is issued not only FAILs, it also ends up 
overwriting its input file -- which is used by another test too, so that 
FAILs as well.  It seems like the solution is "don't do that".

OK to commit?

-Sandra
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