V4L2 on NetBSD

Signed-off-by: Rémi Denis-Courmont <remi@remlab.net>
(cherry picked from commit 0c55b2d8)

configure.ac

@@ -2184,7 +2184,7 @@ then
   fi
 
   CPPFLAGS="${CPPFLAGS_save} ${CPPFLAGS_v4l2}"
-  AC_CHECK_HEADERS(linux/videodev2.h, [
+  AC_CHECK_HEADERS(linux/videodev2.h sys/videoio.h, [
     VLC_ADD_PLUGIN([v4l2])
   ],[])
   CPPFLAGS="${CPPFLAGS_save}"

modules/access/v4l2.c

@@ -51,7 +51,13 @@
 #include <sys/ioctl.h>
 #include <sys/mman.h>
 
-#include <linux/videodev2.h>
+#if defined(HAVE_LINUX_VIDEODEV2_H)
+#   include <linux/videodev2.h>
+#elif defined(HAVE_SYS_VIDEOIO_H)
+#   include <sys/videoio.h>
+#else
+#   error "No Video4Linux2 headers found."
+#endif
 
 #include <poll.h>