util-linux: fix build error in kill

Backport patches from upstream to fix a build error in the kill utility.

Fixes:
| In file included from ../util-linux-2.35.1/misc-utils/kill.c:57:
| ../util-linux-2.35.1/include/pidfd-utils.h: In function ‘pidfd_open’:
| ../util-linux-2.35.1/include/pidfd-utils.h:19:17: error: ‘SYS_pidfd_open’ undeclared (first use in this function); did you mean ‘pidfd_open’?

Signed-off-by: Benjamin Fair <benjaminfair@google.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Signed-off-by: Steve Sakoman <steve@sakoman.com>