libperf: Add PERF_RECORD_NAMESPACES 'struct namespaces_event' to perf/event.h

Move the namespaces_event event definition into libperf's event.h header
include.

In order to keep libperf simple, we switch 'u64/u32/u16/u8' types used
events to their generic '__u*' versions.
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Michael Petlan <mpetlan@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20190825181752.722-5-jolsa@kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/lib/include/perf/event.h

@@ -36,4 +36,11 @@ struct comm_event {
 	char			 comm[16];
 };
 
+struct namespaces_event {
+	struct perf_event_header header;
+	__u32			 pid, tid;
+	__u64			 nr_namespaces;
+	struct perf_ns_link_info link_info[];
+};
+
 #endif /* __LIBPERF_EVENT_H */

tools/perf/util/event.h

@@ -27,13 +27,6 @@
 #define PRI_lx64 PRIx64
 #endif
 
-struct namespaces_event {
-	struct perf_event_header header;
-	u32 pid, tid;
-	u64 nr_namespaces;
-	struct perf_ns_link_info link_info[];
-};
-
 struct fork_event {
 	struct perf_event_header header;
 	u32 pid, ppid;