linux-atm: fix build with GCC 14

Basic changes to make linux-atm build without any issues with GCC 14.

Besides some errors caused by -Wpointer-sign, there was also an issue
with socklen_t not being used for getsockopt() and accept()
sometimes.

I also updated the Debian patch to include the latest changes from
version "1:2.5.1-5.1" in Debian Sid. This allowed me to drop
"600-fix-format-errors.patch" and "700-include_sockios.patch".

Signed-off-by: Rany Hany <rany_hany@riseup.net>

package/network/utils/linux-atm/patches/510-remove-LINUX_NETDEVICE-hack.patch

@@ -28,8 +28,8 @@ in Linux 4.20.
  #include <sys/socket.h>
 -#define _LINUX_NETDEVICE_H /* glibc2 */
  #include <linux/types.h>
+ #include <linux/if.h>
  #include <linux/if_arp.h>
- 
 --- a/src/arpd/io.c
 +++ b/src/arpd/io.c
 @@ -21,7 +21,6 @@
@@ -48,5 +48,5 @@ in Linux 4.20.
  #include <netinet/in.h> /* for ntohs, etc. */
 -#define _LINUX_NETDEVICE_H /* very crude hack for glibc2 */
  #include <linux/types.h>
+ #include <linux/if.h>
  #include <linux/if_arp.h>
- #include <linux/if_ether.h>