testing: Enable Botan and the plugin

ldconfig is required, otherwise the library won't be found by
strongSwan in the same session.

Should later be changed to 2.8.0 or a newer stable release.

testing/scripts/recipes/013_strongswan.mk

@@ -62,6 +62,7 @@ CONFIG_OPTS = \
 	--enable-sqlite \
 	--enable-attr-sql \
 	--enable-mediation \
+	--enable-botan \
 	--enable-openssl \
 	--enable-blowfish \
 	--enable-kernel-pfkey \