perf debug: Remove needless include directives from debug.h

All we need there is a forward declaration for 'union perf_event', so
remove it from there and add missing header directives in places using
things from this indirect include.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lkml.kernel.org/n/tip-7ftk0ztstqub1tirjj8o8xbl@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
diff --git a/tools/perf/builtin-c2c.c b/tools/perf/builtin-c2c.c
index 25a5f18..d1ad694 100644
--- a/tools/perf/builtin-c2c.c
+++ b/tools/perf/builtin-c2c.c
@@ -20,6 +20,7 @@
 #include <sys/param.h>
 #include "debug.h"
 #include "builtin.h"
+#include <subcmd/pager.h>
 #include <subcmd/parse-options.h>
 #include "mem-events.h"
 #include "session.h"
@@ -35,6 +36,7 @@
 #include "thread.h"
 #include "mem2node.h"
 #include "symbol.h"
+#include "ui/ui.h"
 #include "../perf.h"
 
 struct c2c_hists {