package/collectd: security bump to version 5.9.0

package/collectd: security bump to version 5.9.0

Removed patches applied upstream.

Added upstream sha1 & sha512 hashes.

Removed libltdl/COPYING.LIB from LICENSE_FILES after upstream removal
in version 5.8.0:
https://git.octo.it/?p=collectd.git;a=blob;f=ChangeLog;h=7ea5a07f10c0334f9b0f32480590b2c848577559;hb=HEAD#l90

Version 5.7.2 fixed CVE-2017-7401
https://git.octo.it/?p=collectd.git;a=blob;f=ChangeLog;h=7ea5a07f10c0334f9b0f32480590b2c848577559;hb=HEAD#l285

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>