package/netsnmp: requires DES support in openssl

Enable DES in openssl to fix build failure raised since commit
a83d41867c8d69a77d5cd0a665aa216af5340359

Fixes:
 - http://autobuild.buildroot.org/results/76ddd42cfecc596e431490747e3a32b937f95a17

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

package/netsnmp/Config.in

@@ -1,6 +1,7 @@
 config BR2_PACKAGE_NETSNMP
 	bool "netsnmp"
 	depends on BR2_USE_MMU # fork()
+	select BR2_PACKAGE_LIBOPENSSL_ENABLE_DES if BR2_PACKAGE_LIBOPENSSL
 	help
 	  Suite of applications used to implement SNMP v1, SNMP v2c, and
 	  SNMP v3 using both IPv4 and IPv6.