contrib: download openbsd libressl dependency in tarballs

Change-Id: I6bb81df5958402b26699fd4c1bebab61a3799419

contrib/src/libressl/0001-build-don-t-fetch-git-tag-if-openbsd-directory-exist.patch

+From 2fb64a2af2e3519feee18959e260ec90bcbd1f56 Mon Sep 17 00:00:00 2001
+From: Adrien Beraud <adrien.beraud@savoirfairelinux.com>
+Date: Fri, 6 Apr 2018 22:39:08 -0400
+Subject: [PATCH] build: don't fetch git tag if openbsd directory exists
+
+---
+ update.sh | 8 ++++----
+ 1 file changed, 4 insertions(+), 4 deletions(-)
+
+diff --git a/update.sh b/update.sh
+index 9e9ace6..b064154 100755
+--- a/update.sh
++++ b/update.sh
+@@ -11,11 +11,11 @@ if [ ! -d openbsd ]; then
+ 	else
+ 		git clone $LIBRESSL_GIT/openbsd
+ 	fi
++	(cd openbsd
++	 git fetch
++	 git checkout $openbsd_branch
++	 git pull --rebase)
+ fi
+-(cd openbsd
+- git fetch
+- git checkout $openbsd_branch
+- git pull --rebase)
+ 
+ # setup source paths
+ CWD=`pwd`
+-- 
+2.14.1
+

contrib/src/libressl/rules.mak

@@ -20,7 +20,9 @@
 #
 
 LIBRESSL_VERSION := 190bd346e75575b9436a2e9e14b28618f0234e1b
+OPENBSD_VERSION := OPENBSD_6_2
 LIBRESSL_URL := https://github.com/libressl-portable/portable/archive/$(LIBRESSL_VERSION).tar.gz
+OPENBSD_URL := https://github.com/libressl-portable/openbsd/archive/$(OPENBSD_VERSION).tar.gz
 
 # Check if openssl or libressl is already present on the system
 ifeq ($(call need_pkg,"openssl >= 1.0.0" || call need_pkg,"libressl >= 1.0.0"),)
@@ -32,9 +34,14 @@ endif
 $(TARBALLS)/portable-$(LIBRESSL_VERSION).tar.gz:
 	$(call download,$(LIBRESSL_URL))
 
-libressl: portable-$(LIBRESSL_VERSION).tar.gz
+$(TARBALLS)/openbsd-$(OPENBSD_VERSION).tar.gz:
+	$(call download,$(OPENBSD_URL))
+
+libressl: portable-$(LIBRESSL_VERSION).tar.gz openbsd-$(OPENBSD_VERSION).tar.gz
 	$(UNPACK)
 	$(APPLY) $(SRC)/libressl/getpagesize.patch
+	$(APPLY) $(SRC)/libressl/0001-build-don-t-fetch-git-tag-if-openbsd-directory-exist.patch
+	mv openbsd-$(OPENBSD_VERSION) $(UNPACK_DIR)/openbsd
 	$(MOVE)
 
 .libressl: libressl .sum-libressl