package/syslog-ng: remove bogus select

package/syslog-ng: remove bogus select

The eventlog package was removed as part of commit
5e0b1f9c2386e9184256b10ca19a6a7e4f4865cc ("package/eventlog: remove
package"). It used to be a separate package, but it is now part of
syslog-ng itself, which is why the eventlog package was removed.

But commit 5e0b1f9c2386e9184256b10ca19a6a7e4f4865cc forgot to drop the
select BR2_PACKAGE_EVENTLOG, so let's fix this.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>