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 <hekuang@huawei.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/r/1432819735-35040-2-git-send-email-hekuang@huawei.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/lib/traceevent/.gitignore

 TRACEEVENT-CFLAGS
+libtraceevent-dynamic-list