The wiki has been archived so remove the links from manual page
footers. Also replace the wiki link by RTD site in configure and
libbtrfsutil.
Signed-off-by: David Sterba <dsterba@suse.com>
Add pkg-config file for libbtrfsutil which can be used to set up
compilation and link flags.
The paths in pc file depend on prefix variable but ignore DESTDIR.
DESTDIR is used for packaging and it should not affect the paths in pc
file.
Issue: #285
Signed-off-by: Sheng Mao <shngmao@gmail.com>
Signed-off-by: David Sterba <dsterba@suse.com>