perf: explicitly disable libunwind

* it's not included in DEPENDS and it's detected from sysroot

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
kernel: don't copy .so.dbg files into kernel source install

In 3.16+ x86-64 kernel builds produce a vdso64.so.dbg file. If this file is
copied into the kernel source install multiple QA failures are triggered.
Specifically, this file triggers a debug package split that results in
files installed but not shipped, and invalid .debug file errors.

By ensuring that .so files are not copied, we avoid this incorrect split
with no impact on future build phases.

Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
cairo: explicitly disable LTO support by backporting patch which removes it

* cairo-native was failing to build in gentoo with gcc-4.9 and LTO
  enabled, more details in upstream bug
  https://bugs.freedesktop.org/show_bug.cgi?id=77060

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>