libseccomp: update 2.5.2 -> 2.5.3

Drop all patches from MR seccomp/libseccomp#327
as it has stalled, and rebasing them is non-trivial. Please land the
changes upstream first.

Drop 0001-configure.ac-Bump-version-to-2.5.99.patch as upstream
has addressed the issue.

Signed-off-by: Alexander Kanavin <alex@linutronix.de>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

Author: kanavin