Revert "Add g_(d)tls_connection_get_channel_binding_data calls and enums"
This reverts commit 44524b9d.
We were not able to implement this API in glib-networking because it wasn't released until glib 2.65.1, one day before freeze. We eventually landed the implementation via the feature freeze break process, but failed to notice that it introduced new strings. It's much too late to be adding new translatable strings, so implementation will have to wait until next release cycle, after the first glib 2.67 release.