collectd: drop rrdtool selects

Drop indirect rrdtool selects, they're already selected by rrdtool
itself so there's no need.

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Reviewed-by: Vicente Olivert Riera <Vincent.Riera@imgtec.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/collectd/Config.in

@@ -504,11 +504,7 @@ config BR2_PACKAGE_COLLECTD_NETWORK
 config BR2_PACKAGE_COLLECTD_RRDTOOL
 	bool "rrdtool"
 	depends on BR2_USE_WCHAR # rrdtool
-	select BR2_PACKAGE_FREETYPE
-	select BR2_PACKAGE_LIBART
-	select BR2_PACKAGE_LIBPNG
 	select BR2_PACKAGE_RRDTOOL
-	select BR2_PACKAGE_ZLIB
 	help
 	  Writes values to RRD-files.