weechat 1.1-rc1 devel

Devel version, returned the ` gettext ` dep that was removed in #18722 but is now functional again, prunes the redundant ` -DENABLE_GTK=OFF ` option as it’s not a valid option anymore and reformats the args.
This can still be `=> :optional` so we avoid the class-level conditional; this declaration and the `option` declaration together are OK. (sorry to make you commit this three times)