ncurses: use ln -r to generate relative symlink

Instead of using a Python do_install() and calling
oe.path.make_relative_symlink, just pass -r to ln to generate a relative symlink
directly.

Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
ltp: Work around parallel make race

As per the comments, the makefiles use make -C extensively and
this causes particular problems around the kernel syscall header. We
therefore ensure its up to date in advance.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
oeqa/runtime/dmesg: Ignore DMA timeout errors

We see these from qemu images on servers under load. They're not interesting
and clutter the build output so lets ignore them.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>