knot: drop kru.inc.c static_assert that requires lock-free 16-bit atomics

knot: drop kru.inc.c static_assert that requires lock-free 16-bit atomics

The RRL module's kru.inc.c has a `static_assert(ATOMIC_CHAR16_T_LOCK_FREE
== 2, ...)` that breaks the build on any target whose toolchain does
not advertise lock-free 16-bit atomics (e.g. ARMv5 arm926ej-s).
Upstream considers the assertion non-essential and plans to drop it;
they recommended a patch over a Makefile-level RRL disable. Bump
PKG_RELEASE for the patch swap.

Suggested-by: Daniel Salzman <redacted>
Signed-off-by: Alexandru Ardelean <redacted>