tools lib traceevent: Ignore libtrace-dynamic-list file

The libtrace-dynamic-list file is used to export symbols used by
traceevent plugins.

Signed-off-by: He Kuang <[e-mail]>
Cc: Jiri Olsa <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Cc: Wang Nan <[e-mail]>
Link: http://lkml.kernel.org/r/[e-mail]
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/lib/traceevent/.gitignore

···
 TRACEEVENT-CFLAGS
+libtraceevent-dynamic-list