package/libesmtp: requires DES support in openssl

Enable DES in openssl to fix build failure raised since bump to version
1.1.0 in commit b72401692e1ea73a37fcf4c0b421b654e8a2100f

Fixes:
 - http://autobuild.buildroot.org/results/52bce321552d23c10617c4ba4dc5b290e1d43dd5

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

package/libesmtp/Config.in

@@ -1,6 +1,7 @@
 config BR2_PACKAGE_LIBESMTP
 	bool "libesmtp"
 	depends on !BR2_STATIC_LIBS
+	select BR2_PACKAGE_LIBOPENSSL_ENABLE_DES if BR2_PACKAGE_LIBOPENSSL
 	select BR2_PACKAGE_LIBOPENSSL_ENABLE_MD4 if BR2_PACKAGE_LIBOPENSSL
 	help
 	  Library for sending emails through SMTP.