libssh: depends fix

the default was to build with GSSAPI enabled.

Signed-off-by: Armin Kuster <akuster808@gmail.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>

meta-oe/recipes-support/libssh/libssh_0.6.3.bb

@@ -18,6 +18,9 @@ EXTRA_OECMAKE = " \
     -DWITH_ZLIB=1 \
     "
 
+PACKAGECONFIG ??=""
+PACKAGECONFIG[gssapi] = "-DWITH_GSSAPI=1, -DWITH_GSSAPI=0, krb5, "
+
 inherit cmake
 
 do_configure_prepend () {