libssh2: upgrade to 1.7.0

This version includes fix for CVE-2016-0787
and other changes, for details please see:
https://www.libssh2.org/changes.html

Signed-off-by: Jackie Huang <jackie.huang@windriver.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>

meta-oe/recipes-support/libssh2/libssh2_1.7.0.bb

@@ -0,0 +1,24 @@
+SUMMARY = "A client-side C library implementing the SSH2 protocol"
+HOMEPAGE = "http://www.libssh2.org/"
+SECTION = "libs"
+
+DEPENDS = "zlib"
+
+LICENSE = "BSD"
+LIC_FILES_CHKSUM = "file://COPYING;md5=c5cf34fc0acb44b082ef50ef5e4354ca"
+
+SRC_URI = "http://www.libssh2.org/download/${BP}.tar.gz"
+SRC_URI[md5sum] = "b01662a210e94cccf2f76094db7dac5c"
+SRC_URI[sha256sum] = "e4561fd43a50539a8c2ceb37841691baf03ecb7daf043766da1b112e4280d584"
+
+inherit autotools pkgconfig
+
+EXTRA_OECONF += "\
+                 --with-libz \
+                 --with-libz-prefix=${STAGING_LIBDIR} \
+                "
+
+# only one of openssl and gcrypt could be set
+PACKAGECONFIG ??= "openssl"
+PACKAGECONFIG[openssl] = "--with-openssl --with-libssl-prefix=${STAGING_LIBDIR},--without-openssl,openssl"
+PACKAGECONFIG[gcrypt] = "--with-libgcrypt --with-libgcrypt-prefix=${STAGING_EXECPREFIXDIR},--without-libgcrypt,libgcrypt"