unix: add nftables_compat defines and types

Some types from nftables compatibility header are missing
    in unix package and this change adds those missing types

    Fixes golang/go#40898

unix/linux/types.go

@@ -105,6 +105,7 @@ struct termios2 {
 #include <linux/net_namespace.h>
 #include <linux/net_tstamp.h>
 #include <linux/netfilter/nf_tables.h>
+#include <linux/netfilter/nf_tables_compat.h>
 #include <linux/netfilter/nfnetlink.h>
 #include <linux/netfilter.h>
 #include <linux/netlink.h>
@@ -1742,6 +1743,24 @@ const (
 	NFT_NG_RANDOM                     = C.NFT_NG_RANDOM
 )
 
+// netfilter nf_tables_compat
+// generated using:
+// perl -nlE '/^\s*(NFT\w+)/ && say "$1 = C.$1"' /usr/include/linux/netfilter/nf_tables_compat.h
+const (
+	NFTA_TARGET_UNSPEC = C.NFTA_TARGET_UNSPEC
+	NFTA_TARGET_NAME   = C.NFTA_TARGET_NAME
+	NFTA_TARGET_REV    = C.NFTA_TARGET_REV
+	NFTA_TARGET_INFO   = C.NFTA_TARGET_INFO
+	NFTA_MATCH_UNSPEC  = C.NFTA_MATCH_UNSPEC
+	NFTA_MATCH_NAME    = C.NFTA_MATCH_NAME
+	NFTA_MATCH_REV     = C.NFTA_MATCH_REV
+	NFTA_MATCH_INFO    = C.NFTA_MATCH_INFO
+	NFTA_COMPAT_UNSPEC = C.NFTA_COMPAT_UNSPEC
+	NFTA_COMPAT_NAME   = C.NFTA_COMPAT_NAME
+	NFTA_COMPAT_REV    = C.NFTA_COMPAT_REV
+	NFTA_COMPAT_TYPE   = C.NFTA_COMPAT_TYPE
+)
+
 type RTCTime C.struct_rtc_time
 
 type RTCWkAlrm C.struct_rtc_wkalrm

unix/ztypes_linux.go

@@ -1752,6 +1752,21 @@ const (
 	NFT_NG_RANDOM                     = 0x1
 )
 
+const (
+	NFTA_TARGET_UNSPEC = 0x0
+	NFTA_TARGET_NAME   = 0x1
+	NFTA_TARGET_REV    = 0x2
+	NFTA_TARGET_INFO   = 0x3
+	NFTA_MATCH_UNSPEC  = 0x0
+	NFTA_MATCH_NAME    = 0x1
+	NFTA_MATCH_REV     = 0x2
+	NFTA_MATCH_INFO    = 0x3
+	NFTA_COMPAT_UNSPEC = 0x0
+	NFTA_COMPAT_NAME   = 0x1
+	NFTA_COMPAT_REV    = 0x2
+	NFTA_COMPAT_TYPE   = 0x3
+)
+
 type RTCTime struct {
 	Sec   int32
 	Min   int32