perf tools: Clean up warnings list in the Makefile

Make it easier to turn warnings on/off by using a separate
line for each warning added.

Some of the warnings have too much of a nuisance factor and
we might want to turn them off in the future.

Cc: Arjan van de Ven <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Mike Galbraith <[email protected]>
Cc: Paul Mackerras <[email protected]>
Cc: Arnaldo Carvalho de Melo <[email protected]>
Cc: Frederic Weisbecker <[email protected]>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <[email protected]>

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