Add glib-networking to multilib whitelist

Make sure glib-networking is always installed multilib. Right now the
dependency that makes glib-networking multilib is Requires:
glib-networking%{_isa} in libsoup, but if libsoup is not in the same
repo as glib-networking (as is the case right now with the F30 updates
repo), glib-networking can drop out of multilib.

Fix this by explicitly listing it as multilib.

https://pagure.io/releng/issue/8365

Signed-off-by: Kalev Lember <klember@redhat.com>

fedora.conf

@@ -211,7 +211,8 @@ multilib_whitelist = {
         'fakechroot-libs','mesa-vdpau-drivers', 'p11-kit-trust',
         'mariadb-connector-odbc', 'compiler-rt',
         'nvidia-query-resource-opengl-lib',
-        'ibus-libs', 'ibus-gtk2', 'ibus-gtk3'
+        'ibus-libs', 'ibus-gtk2', 'ibus-gtk3',
+        'glib-networking'
     ],
 }