lttng-tools: bump to version 2.8.2

lttng-tools: bump to version 2.8.2

The current patches are dropped because they were merged upstream.

The new patches exist to fix the build with musl. They were submitted on
the lttng-dev mailing list, but not merged yet, or not merged in 2.8.2.

LTTng-tools now has its man pages written in AsciiDoc and they get
converted to troff at build time. This is not needed in a Buildroot
image anyway.

The --enable-lttng-ust/--disable-lttng-ust configure options are renamed
to --with-lttng-ust/--without-lttng-ust in v2.8.

Signed-off-by: Philippe Proulx <eeppeliteloop@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>