gh-127072: Remove outdated socket.NETLINK_* constants. (GH-127256)

Remove seriously outdated netlink constants.

Co-authored-by: Gregory P. Smith <[email protected]>

Author: rruuaanng

Misc/NEWS.d/next/Library/2024-11-25-19-04-10.gh-issue-127072.-c284K.rst

@@ -0,0 +1 @@
+Remove outdated ``socket.NETLINK_*`` constants not present in Linux kernels beyond 2.6.17.

Modules/socketmodule.c

@@ -7594,36 +7594,20 @@ socket_exec(PyObject *m)
     /*  */
     ADD_INT_MACRO(m, AF_NETLINK);
     ADD_INT_MACRO(m, NETLINK_ROUTE);
-#ifdef NETLINK_SKIP
-    ADD_INT_MACRO(m, NETLINK_SKIP);
-#endif
-#ifdef NETLINK_W1
-    ADD_INT_MACRO(m, NETLINK_W1);
-#endif
     ADD_INT_MACRO(m, NETLINK_USERSOCK);
     ADD_INT_MACRO(m, NETLINK_FIREWALL);
-#ifdef NETLINK_TCPDIAG
-    ADD_INT_MACRO(m, NETLINK_TCPDIAG);
-#endif
 #ifdef NETLINK_NFLOG
     ADD_INT_MACRO(m, NETLINK_NFLOG);
 #endif
 #ifdef NETLINK_XFRM
     ADD_INT_MACRO(m, NETLINK_XFRM);
 #endif
-#ifdef NETLINK_ARPD
-    ADD_INT_MACRO(m, NETLINK_ARPD);
-#endif
-#ifdef NETLINK_ROUTE6
-    ADD_INT_MACRO(m, NETLINK_ROUTE6);
-#endif
+#ifdef NETLINK_IP6_FW
     ADD_INT_MACRO(m, NETLINK_IP6_FW);
+#endif
 #ifdef NETLINK_DNRTMSG
     ADD_INT_MACRO(m, NETLINK_DNRTMSG);
 #endif
-#ifdef NETLINK_TAPBASE
-    ADD_INT_MACRO(m, NETLINK_TAPBASE);
-#endif
 #ifdef NETLINK_CRYPTO
     ADD_INT_MACRO(m, NETLINK_CRYPTO);
 #endif