[PATCH] Fix warning in elf/tst-unique4lib.cc.

[Torvald Riegel]

This fixes a -Werror failure by marking the variable as used.  This is
similar to this fix for the same file:
https://sourceware.org/ml/libc-alpha/2014-11/msg00768.html

OK?


2014-12-15  Torvald Riegel  <triegel@redhat.com>

	* elf/tst-unique4lib.cc(a): Mark as used.

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