package/libssh2: bump version

package/libssh2: bump version

Added license hash.

This bump includes "ECDSA key types are now explicit"
https://github.com/libssh2/libssh2/commit/62b825c8afb9e5efb6ea9c05b40b309590249fb6

which is needed by vlc since
http://git.videolan.org/?p=vlc.git;a=commitdiff;h=afee1e72a8e08866bbe35d1a57e859cac81052b4

Fixes
http://autobuild.buildroot.net/results/579/579e2418e59680ad4bf3dc85f2918457b6221bfa/
http://autobuild.buildroot.net/results/c73/c7348c442d3f585ace0bc62860f802dc08150776/
http://autobuild.buildroot.net/results/731/73187b883d7fe14b08a4903b326706c9d1f8b519/
http://autobuild.buildroot.net/results/f6d/f6d4fca6063c81a8e240fed4db89269e455f057e/
http://autobuild.buildroot.net/results/371/371f4f017f4a5af0ac6d6a8b1b8276858ad47f75/
http://autobuild.buildroot.net/results/d6a/d6a3b43211eb740bdebbb339668b854d26e878b7/
http://autobuild.buildroot.net/results/a05/a0576aeeb57a49958e5229d9ec08f2bd792d48b6/
http://autobuild.buildroot.net/results/57a/57a9ae2f157183a86fbf1b2cc5cbb38e948690ce/

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>