Add compatibility setting for NSS

https://github.com/libreswan/libreswan/commit/65a497959a0e1ca615341109eaad5e75723839d6

We patch a different file because a later commit moved the setting to this file.

diff --git a/lib/libswan/ike_alg_encrypt_nss_gcm_ops.c b/lib/libswan/ike_alg_encrypt_nss_gcm_ops.c
index 93a027089a..571913cc1e 100644
--- a/lib/libswan/ike_alg_encrypt_nss_gcm_ops.c
+++ b/lib/libswan/ike_alg_encrypt_nss_gcm_ops.c
@@ -16,6 +16,12 @@
 #include <stdio.h>
 #include <stdlib.h>
 
+/*
+ * Special advise from Bob Relyea - needs to go before any nss include
+ *
+ */
+#define NSS_PKCS11_2_0_COMPAT 1
+
 #include "lswlog.h"
 #include "lswnss.h"
 #include "prmem.h"