tracing: install trace events file only if necessary

It is not useful when configuring with --enable-trace-backends=nop.

Signed-off-by: Carlos Santos <casantos@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-ID: <20230408010410.281263-1-casantos@redhat.com>
1 file changed