perf sched: Use perf_tool as ancestor

So that we can remove all the globals.

Before:

   text	   data	    bss	    dec	    hex	filename
1586833	 110368	1438600	3135801	 2fd939	/tmp/oldperf

After:

   text	   data	    bss	    dec	    hex	filename
1629329	  93568	 848328	2571225	 273bd9	/root/bin/perf

Cc: David Ahern <[email protected]>
Cc: Frederic Weisbecker <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Mike Galbraith <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Paul Mackerras <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Stephane Eranian <[email protected]>
Link: http://lkml.kernel.org/n/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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