package/procps-ng: fix build without __NR_pidfd_open

Fix the following build failure without __NR_pidfd_open raised since
bump to version 3.3.17 in commit
cc28c7aa6df7798ce5ca79d6d1c7c2eb115ba220 and
https://gitlab.com/procps-ng/procps/-/commit/c8384e682c1cfb3b2dc797e0f8a3cbaaccf7a3da:

pgrep.c: In function 'pidfd_open':
pgrep.c:748:17: error: '__NR_pidfd_open' undeclared (first use in this function); did you mean 'pidfd_open'?
  748 |  return syscall(__NR_pidfd_open, pid, flags);
      |                 ^~~~~~~~~~~~~~~
      |                 pidfd_open

Fixes:
 - http://autobuild.buildroot.org/results/f23a5156e641b2ebdd673973dec0f9c87760c688

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit c07caa732b5c4ca5836ee81ce90f57f967dcc721)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/procps-ng/0003-fix-pifd_open-check.patch

@@ -0,0 +1,59 @@
+From 0cce3e981540c28d2f703b9ab16c04d0df8fa03d Mon Sep 17 00:00:00 2001
+From: Fabrice Fontaine <fontaine.fabrice@gmail.com>
+Date: Thu, 3 Nov 2022 18:24:53 +0100
+Subject: [PATCH] fix pifd_open check
+
+Replace AC_CHECK_FUNC by AC_CHECK_FUNCS otherwise HAVE_PIDFD_OPEN will
+never be defined resulting in the following build failure if pidfd_open
+is available but __NR_pidfd_open is not available:
+
+pgrep.c: In function 'pidfd_open':
+pgrep.c:748:17: error: '__NR_pidfd_open' undeclared (first use in this function); did you mean 'pidfd_open'?
+  748 |  return syscall(__NR_pidfd_open, pid, flags);
+      |                 ^~~~~~~~~~~~~~~
+      |                 pidfd_open
+
+This build failure is raised since the addition of pwait in version
+3.3.17 and
+https://gitlab.com/procps-ng/procps/-/commit/c8384e682c1cfb3b2dc797e0f8a3cbaaccf7a3da
+
+Fixes:
+ - http://autobuild.buildroot.org/results/f23a5156e641b2ebdd673973dec0f9c87760c688
+
+Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
+[Upstream status:
+https://gitlab.com/procps-ng/procps/-/merge_requests/166]
+---
+ configure.ac | 2 +-
+ src/pgrep.c  | 2 +-
+ 2 files changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/configure.ac b/configure.ac
+index 629881a6..1a3ccdb8 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -160,7 +160,7 @@ AC_TRY_COMPILE([#include <errno.h>],
+ 		AC_MSG_RESULT(yes),
+ 		AC_MSG_RESULT(no))
+ 
+-AC_CHECK_FUNC([pidfd_open], [enable_pwait=yes], [
++AC_CHECK_FUNCS([pidfd_open], [enable_pwait=yes], [
+   AC_MSG_CHECKING([for __NR_pidfd_open])
+   AC_COMPILE_IFELSE([AC_LANG_SOURCE([
+ #include <sys/syscall.h>
+diff --git a/pgrep.c b/pgrep.c
+index c4ad5da3..29cfedf7 100644
+--- a/pgrep.c
++++ b/pgrep.c
+@@ -38,7 +38,7 @@
+ #include <stdbool.h>
+ #include <time.h>
+ 
+-#if defined(ENABLE_PWAIT) && !defined(HAVE_PIDFD_OPEN)
++#if defined(ENABLE_PWAIT)
+ #include <sys/epoll.h>
+ #include <sys/syscall.h>
+ #endif
+-- 
+2.35.1
+