package/libssh: security bump to version 0.9.3

Fixes the following security vulnerabilities:

- CVE-2019-14889: Unsanitized location in scp could lead to unwanted command
  execution.

And adds various hardening improvements.  For details, see the announcement:

https://www.libssh.org/2019/12/10/libssh-0-9-3-and-libssh-0-8-8-security-release/

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

package/libssh/libssh.hash

@@ -1,5 +1,5 @@
 # Locally calculated after checking pgp signature
-# https://www.libssh.org/files/0.9/libssh-0.9.0.tar.xz.asc
+# https://www.libssh.org/files/0.9/libssh-0.9.3.tar.xz.asc
 # with key 8DFF53E18F2ABC8D8F3C92237EE0FC4DCC014E3D
-sha256 25303c2995e663cd169fdd902bae88106f48242d7e96311d74f812023482c7a5  libssh-0.9.0.tar.xz
+sha256 2c8b5f894dced58b3d629f16f3afa6562c20b4bdc894639163cf657833688f0c  libssh-0.9.3.tar.xz
 sha256 1656186e951db1c010a8485481fa94587f7e53a26d24976bef97945ad0c4df5a  COPYING

package/libssh/libssh.mk

@@ -5,7 +5,7 @@
 ################################################################################
 
 LIBSSH_VERSION_MAJOR = 0.9
-LIBSSH_VERSION = $(LIBSSH_VERSION_MAJOR).0
+LIBSSH_VERSION = $(LIBSSH_VERSION_MAJOR).3
 LIBSSH_SOURCE = libssh-$(LIBSSH_VERSION).tar.xz
 LIBSSH_SITE = https://www.libssh.org/files/$(LIBSSH_VERSION_MAJOR)
 LIBSSH_LICENSE = LGPL-2.1