package/snort: select libdnet package

"libdnet is in the dependency chain of snort that has added it to its
_DEPENDENCIES variable without selecting it or depending on it from
Config.in"

Fixes:
http://autobuild.buildroot.net/results/9cf/9cf5883d1ed95d3d76d529a9a25f0e600adf25cd

Signed-off-by: Romain Naour <romain.naour@gmail.com>
Cc: Sergio Prado <sergio.prado@e-labworks.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/snort/Config.in

@@ -4,6 +4,7 @@ config BR2_PACKAGE_SNORT
 	depends on BR2_USE_MMU # fork()
 	depends on !BR2_STATIC_LIBS # daq
 	depends on BR2_TOOLCHAIN_HAS_NATIVE_RPC || BR2_TOOLCHAIN_HAS_THREADS # libtirpc
+	select BR2_PACKAGE_LIBDNET
 	select BR2_PACKAGE_LIBPCAP
 	select BR2_PACKAGE_DAQ
 	select BR2_PACKAGE_PCRE