package/eudev: fix compile-time issue with very old kernel headers

Kernel versions prior to 3.4 did not have V4L2_CAP_DEVICE_CAPS and
compiling against such a kernel will fail.

This patch introduces a version check and makes eudev fall back to
v2cap.capabilities on these kernels.

Signed-off-by: Stefan Ott <stefan@ott.net>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
(cherry picked from commit 8f646eb2a124098bc7c34373a4921a19d436f26e)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/eudev/0002-Fix-compile-time-issue-on-very-old-kernels.patch

@@ -0,0 +1,44 @@
+From 09b536e0b9d0964674936901ab9d2954f935c8b4 Mon Sep 17 00:00:00 2001
+From: Stefan Ott <stefan@ott.net>
+Date: Wed, 5 Apr 2023 18:20:37 +0200
+Subject: [PATCH] Fix compile-time issue on very old kernels
+
+Kernel versions prior to 3.4 did not have V4L2_CAP_DEVICE_CAPS and
+compiling against such a kernel will fail.
+
+This patch introduces a version check and makes eudev fall back to
+v2cap.capabilities on these kernels.
+
+Upstream: https://github.com/eudev-project/eudev/commit/09b536e0b9d0964674936901ab9d2954f935c8b4
+Signed-off-by: Stefan Ott <stefan@ott.net>
+---
+ src/v4l_id/v4l_id.c | 3 +++
+ 1 file changed, 3 insertions(+)
+
+diff --git a/src/v4l_id/v4l_id.c b/src/v4l_id/v4l_id.c
+index 6bf45effe..702d5b687 100644
+--- a/src/v4l_id/v4l_id.c
++++ b/src/v4l_id/v4l_id.c
+@@ -28,6 +28,7 @@
+ #include <sys/types.h>
+ #include <sys/time.h>
+ #include <sys/ioctl.h>
++#include <linux/version.h>
+ #include <linux/videodev2.h>
+ 
+ #include "util.h"
+@@ -71,9 +72,11 @@ int main(int argc, char *argv[]) {
+                 printf("ID_V4L_VERSION=2\n");
+                 printf("ID_V4L_PRODUCT=%s\n", v2cap.card);
+                 printf("ID_V4L_CAPABILITIES=:");
++#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)
+                 if (v2cap.capabilities & V4L2_CAP_DEVICE_CAPS)
+                         capabilities = v2cap.device_caps;
+                 else
++#endif
+                         capabilities = v2cap.capabilities;
+                 if ((capabilities & V4L2_CAP_VIDEO_CAPTURE) > 0 ||
+                     (capabilities & V4L2_CAP_VIDEO_CAPTURE_MPLANE) > 0)
+-- 
+2.40.0
+