strongswan: add ${PN}-plugin-curve25519 to RDEPENDS

From: Mingli Yu <[email protected]>

* The default DH group curve25519 depends on
an optional plugin ${PN}-plugin-curve25519,
add it to RDEPENDS to avoid below error:

  root@test:~# ipsec up host-lan
  initiating IKE_SA host-lan[1] to 192.168.7.2
  configured DH group CURVE_25519 not supported
  tried to checkin and delete nonexisting IKE_SA
  establishing connection 'host-lan' failed

---
 meta-networking/recipes-support/strongswan/strongswan_5.5.3.bb | 1 +
 1 file changed, 1 insertion(+)

index 3fb56bcfe..97ebcd8a5 100644
@@ -123,6 +123,7 @@ RDEPENDS_${PN} += "\
     ${PN}-plugin-x509 \
     ${PN}-plugin-xauth-generic \
     ${PN}-plugin-xcbc \
+    ${PN}-plugin-curve25519 \
     "
 
 RPROVIDES_${PN} += "${PN}-systemd"

2.13.3