testsuite, c++, coroutines: Avoid 'unused' warnings [NFC].

The 'torture' section of the coroutine tests is primarily about checking
correct operation of the generated code.  It should, ideally, be possible
to run this part of the testsuite with '-Wall' and expect no fails.  In
the case that we wish to test for a specific diagnostic (and that it does
not appear over a range of optimisation/debug conditions) then we should
make that explict (as done, for example, in pr109867.C).

The tests amended here have warnings because of unused entities; in many
cases those are relevant to the test, and so we just mark them with
__attribute__((__unused__)).

We amend the debug output in coro.h to avoid similar warnings when print
output is disabled (the default).

gcc/testsuite/ChangeLog:

	* g++.dg/coroutines/coro.h: Use a variadic macro for PRINTF to
	avoid unused warnings when output is disabled.
	* g++.dg/coroutines/torture/co-await-04-control-flow.C: Avoid
	unused warnings.
	* g++.dg/coroutines/torture/co-ret-13-template-2.C: Likewise.
	* g++.dg/coroutines/torture/exceptions-test-01-n4849-a.C: Likewise.
	* g++.dg/coroutines/torture/local-var-04-hiding-nested-scopes.C:
	Likewise.
	* g++.dg/coroutines/torture/pr109867.C: Likewise.

Signed-off-by: Iain Sandoe <iain@sandoe.co.uk>

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