libssh: Fix compile without OpenSSL deprecated APIs

Backported several patches from version 0.8 to fix this.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

libs/libssh/patches/0011-pki_crypto-Avoid-segfault-with-OpenSSL-1.1.0.patch

@@ -0,0 +1,29 @@
+From ab67e42d6a0529f5fb81ee86049bf10abe99f839 Mon Sep 17 00:00:00 2001
+From: Jakub Jelen <jjelen@redhat.com>
+Date: Tue, 7 Nov 2017 09:38:40 +0100
+Subject: [PATCH] pki_crypto: Avoid segfault with OpenSSL 1.1.0
+
+Signed-off-by: Jakub Jelen <jjelen@redhat.com>
+Reviewed-by: Andreas Schneider <asn@cryptomilk.org>
+---
+ src/pki_crypto.c | 4 ++++
+ 1 file changed, 4 insertions(+)
+
+diff --git a/src/pki_crypto.c b/src/pki_crypto.c
+index 34d6e81c..30f49a81 100644
+--- a/src/pki_crypto.c
++++ b/src/pki_crypto.c
+@@ -452,6 +452,10 @@ int pki_key_generate_rsa(ssh_key key, int parameter){
+ int pki_key_generate_dss(ssh_key key, int parameter){
+     int rc;
+ #if OPENSSL_VERSION_NUMBER > 0x10100000L
++    key->dsa = DSA_new();
++    if (!key->dsa) {
++        return SSH_ERROR;
++    }
+     rc = DSA_generate_parameters_ex(key->dsa,
+                                     parameter,
+                                     NULL,  /* seed */
+-- 
+2.19.1
+