Please add support for libgupnp/libgssdp 1.6

[Christian Marillat]

Hi,

libgupnp/gssdp 1.2 has been removed from Debian
now we have libgupnp/gssdp 1.6 in Debian and in Ubuntu 22.04

Christian

[vc (vclp)]

I believe the following should help with some of the incompatibilities with 1.3.1 and bumping these versions up ( tested from some manual tweaking )

file `src/urc-main.c`:
- `GUPnPWhiteList` change to `GUPnPContextFilter`
- `gupnp_context_manager_get_white_list` change to `gupnp_context_manager_get_context_filter`
- `gupnp_white_list_add_entry` change to `gupnp_context_filter_add_entry`
- `gupnp_white_list_set_enabled` change to `gupnp_context_filter_set_enabled`
- i believe `gupnp_service_info_get_introspection_async` gets changed to `gupnp_service_info_introspect_async`; did not check on invalid args so commented it out (its in a debug area)

then converted any (case insensitive matches) of the following in files `configure` and `src/urc-upnp.c`
- `gssdp-1.2` change to `gssdp-1.6`
- `gssdp1.2` change to `gssdp1.6`
- `gupnp-1.2` change to gupnp-1.6`
- `gupnp1.2` change to `gupnp1.6`