Contribs: add libssh2

contrib/src/ssh2/SHA512SUMS

+707e0634b74fcf0f5ae4e46d9807907db7cd09328d553a67c49e9e11d852ae85843a7dcbe3f002e639eb2704e53e865c640c8fe85dcada330d0160708e8b5177  libssh2-1.4.3.tar.gz

contrib/src/ssh2/no-tests.patch

+--- libssh2-1.4.3/Makefile.am.orig	2014-01-24 18:42:51.602763926 +0100
++++ libssh2-1.4.3/Makefile.am	2014-01-24 18:42:58.522873002 +0100
+@@ -1,6 +1,6 @@
+ AUTOMAKE_OPTIONS = foreign nostdinc
+ 
+-SUBDIRS = src tests docs
++SUBDIRS = src docs
+ if BUILD_EXAMPLES
+ SUBDIRS += example
+ endif

contrib/src/ssh2/rules.mak

+# ssh2
+
+LIBSSH2_VERSION := 1.4.3
+LIBSSH2_URL := http://www.libssh2.org/download/libssh2-$(LIBSSH2_VERSION).tar.gz
+
+ifdef BUILD_NETWORK
+PKGS += ssh2
+endif
+ifeq ($(call need_pkg,"libssh2"),)
+PKGS_FOUND += ssh2
+endif
+
+$(TARBALLS)/libssh2-$(LIBSSH2_VERSION).tar.gz:
+	$(call download,$(LIBSSH2_URL))
+
+.sum-ssh2: libssh2-$(LIBSSH2_VERSION).tar.gz
+
+ssh2: libssh2-$(LIBSSH2_VERSION).tar.gz .sum-ssh2
+	$(UNPACK)
+	$(APPLY) $(SRC)/ssh2/no-tests.patch
+	$(MOVE)
+
+DEPS_ssh2 = gcrypt $(DEPS_gcrypt)
+
+.ssh2: ssh2
+	$(RECONF)
+	cd $< && $(HOSTVARS) ./configure $(HOSTCONF) --disable-examples-build
+	cd $< && $(MAKE) install
+	touch $@