[v3] Avoid -Wall warnings in the testsuite

[Jakub Jelinek]

On Tue, Jun 08, 2010 at 02:47:10AM +0200, Paolo Carlini wrote:
> tested x86_64-linux, CXXFLAGS="-O2 -g -Wall", committed.

Anything that looked like a compiler bug (i.e. decl on which it warned, yet
it was used somewhere else than on lhs of an assignment)?

The two PRs I've fixed yesterday were from quick skimming of the libstdc++
testsuite results with
RUNTESTFLAGS=--target_board=unix/-Wunused-but-set-variable/-Wunused-but-set-parameter
but of course I could have missed something...

	Jakub