perf ui: Move hists browser to util/ui/browsers/

LKML-Reference: <new-submission>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/pstack.h

@@ -1,6 +1,8 @@
 #ifndef _PERF_PSTACK_
 #define _PERF_PSTACK_
 
+#include <stdbool.h>
+
 struct pstack;
 struct pstack *pstack__new(unsigned short max_nr_entries);
 void pstack__delete(struct pstack *self);