rfx_context_new does not take any parameter
Drop LIBVNCSERVER_WITH_CLIENT_TLS ifdef's

Now that libvncserver is no longer part of Remmina, the ifdef
is never taken into account. Removing it to enable GNUTLS support.
Add shebangs to external tool scripts
Merge branch 'dktrkranz-gtk3' into gtk3
Undo of 07bb6f3d5ce48144dff239503bbc3c9f6da87229