build: disable libseat subproject server and man pages
When libseat is built as a subproject, we're not interested in building the server or the man pages.
Due to an influx of spam, we have had to impose restrictions on new accounts. Please see this wiki page for instructions on how to get full permissions. Sorry for the inconvenience.
When libseat is built as a subproject, we're not interested in building the server or the man pages.