.gitignore: add trace/generated-events.[ch]

Don't display autogenerated files in git-status(1).

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

.gitignore

@@ -7,6 +7,8 @@ trace/generated-tracers.h
 trace/generated-tracers.c
 trace/generated-tracers-dtrace.h
 trace/generated-tracers-dtrace.dtrace
+trace/generated-events.h
+trace/generated-events.c
 libcacard/trace/generated-tracers.c
 *-timestamp
 *-softmmu