trace-cmd stat: Add sub-buffer size

Show the sub-buffer size if the file system supports it and it is different
than the architecture page size.

This requires libtracefs 1.8, so update the Makefile with that
requirement.

Link: https://lore.kernel.org/linux-trace-devel/20240108184123.62f9be6b@gandalf.local.home

Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
3 files changed