gtk-vnc: fix build (pygtk was removed)

srcpkgs/gtk-vnc/template

@@ -4,7 +4,8 @@ version=0.8.0
 revision=1
 hostmakedepends="automake gettext-devel glib-devel gobject-introspection
  intltool libgcrypt-devel pkg-config"
-makedepends="gnutls-devel gtk+3-devel libsasl-devel $(vopt_if gir 'vala-devel')"
+makedepends="gnutls-devel gtk+-devel gtk+3-devel libsasl-devel
+ $(vopt_if gir 'vala-devel')"
 configure_args="$(vopt_enable gir introspection)"
 short_desc="VNC viewer widget for GTK"
 maintainer="Juan RP <xtraeme@voidlinux.eu>"