perf callchain: Move the callchain_param extern to callchain.h

It was lost in hist.h, move it to where it belongs, callchain.h, as
there are places that gets hist.h by means of evsel.h, and since evsel.h
is being untangled from hist.h...

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: David Ahern <dsahern@gmail.com>
Cc: Don Zickus <dzickus@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jean Pihet <jean.pihet@linaro.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-0rg7ji1jnbm6q6gj35j37jby@git.kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/builtin-record.c

@@ -14,6 +14,7 @@
 #include "util/parse-options.h"
 #include "util/parse-events.h"
 
+#include "util/callchain.h"
 #include "util/header.h"
 #include "util/event.h"
 #include "util/evlist.h"

tools/perf/util/callchain.h

@@ -65,6 +65,8 @@ struct callchain_param {
 	enum chain_key		key;
 };
 
+extern struct callchain_param callchain_param;
+
 struct callchain_list {
 	u64			ip;
 	struct map_symbol	ms;

tools/perf/util/evsel.c

@@ -15,6 +15,7 @@
 #include <linux/perf_event.h>
 #include <sys/resource.h>
 #include "asm/bug.h"
+#include "callchain.h"
 #include "evsel.h"
 #include "evlist.h"
 #include "util.h"

tools/perf/util/hist.h

@@ -8,8 +8,6 @@
 #include "color.h"
 #include "ui/progress.h"
 
-extern struct callchain_param callchain_param;
-
 struct hist_entry;
 struct addr_location;
 struct symbol;

tools/perf/util/scripting-engines/trace-event-python.c

@@ -28,6 +28,7 @@
 
 #include "../../perf.h"
 #include "../debug.h"
+#include "../callchain.h"
 #include "../evsel.h"
 #include "../util.h"
 #include "../event.h"