strace: update to 4.8

Update strace to 4.8:

* Update License file.
* Remove the backport patches which are already in version 4.8.
* Add file git-version-gen from git repo. Without this file configure
  fails.

Signed-off-by: Kai Kang <kai.kang@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
strace: add configure options libaio and acl

Add strace configure options libaio and acl to enable or disable build
with them. Then PACKAGECONFIG can be used to handle dependency.

Set "libaio" as a default feature of PACKAGECONFIG.

Signed-off-by: Kai Kang <kai.kang@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
psplash: Bump PR to allow removal of PRINC from meta-yocto

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