perf tools: Add signal.h to places using its definitions

And remove it from util.h, disentangling it a bit more.

Link: http://lkml.kernel.org/n/tip-2zg9s5nx90yde64j3g4z2uhk@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/arch/x86/tests/intel-cqm.c

@@ -6,6 +6,7 @@
 #include "evsel.h"
 #include "arch-tests.h"
 
+#include <signal.h>
 #include <sys/mman.h>
 #include <errno.h>
 #include <string.h>