package/atf: fix non-threaded build

Buildroot commit d6c3257e93 bumped the
package from 0.21 to 0.23. Upstream release 0.22 includes commit
d7c7c53c06
which uses CLOCK_MONOTONIC without including time.h.

Fixes:
https://autobuild.buildroot.net/results/41b/41b25ee8e66e34323eca011e4b5fe479ece9ed76/

Two minimal defconfigs to reproduce the build error:

BR2_TOOLCHAIN_BUILDROOT_UCLIBC=y
BR2_PTHREADS_NONE=y
BR2_TOOLCHAIN_BUILDROOT_CXX=y
BR2_PACKAGE_ATF=y

BR2_TOOLCHAIN_BUILDROOT_UCLIBC=y
BR2_PTHREADS_NONE=y
BR2_GCC_VERSION_13_X=y
BR2_TOOLCHAIN_BUILDROOT_CXX=y
BR2_PACKAGE_ATF=y

All defconfigs of the build errors recorded by the buildroot autobuilders
contain BR2_PTHREADS_NONE=y.

Signed-off-by: Bernd Kuhls <bernd@kuhls.net>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/atf/0001-atf-check.cpp-include-time.h.patch

@@ -0,0 +1,33 @@
+From 67e7d350a15aff88c151b1fc838dac83d35be955 Mon Sep 17 00:00:00 2001
+From: Bernd Kuhls <bernd@kuhls.net>
+Date: Sat, 22 Nov 2025 23:47:41 +0100
+Subject: [PATCH] atf-check.cpp: include time.h
+
+Fixes build error with gcc 14 as reported by the buildroot autobuilders:
+https://autobuild.buildroot.net/results/41b/41b25ee8e66e34323eca011e4b5fe479ece9ed76/build-end.log
+
+atf-sh/atf-check.cpp: In function 'useconds_t get_monotonic_useconds()':
+atf-sh/atf-check.cpp:183:24: error: 'CLOCK_MONOTONIC' was not declared in this scope
+
+Upstream: https://github.com/freebsd/atf/commit/67e7d350a15aff88c151b1fc838dac83d35be955
+
+Signed-off-by: Bernd Kuhls <bernd@kuhls.net>
+---
+ atf-sh/atf-check.cpp | 1 +
+ 1 file changed, 1 insertion(+)
+
+diff --git a/atf-sh/atf-check.cpp b/atf-sh/atf-check.cpp
+index 1354e3a..94da413 100644
+--- a/atf-sh/atf-check.cpp
++++ b/atf-sh/atf-check.cpp
+@@ -30,6 +30,7 @@ extern "C" {
+ #include <limits.h>
+ #include <signal.h>
+ #include <stdint.h>
++#include <time.h>
+ #include <unistd.h>
+ }
+ 
+-- 
+2.47.3
+