net: provide defines for _POLICY_FAILED until all code is updated

Upstream introduced ICMPV6_POLICY_FAIL for code 5 of destination
unreachable, conflicting with our name.

Add appropriate defines to allow our code to build with the new
name until we have updated our local patches for older kernels
and userspace packages.

Signed-off-by: Jonas Gorski <jogo@openwrt.org>

include/uapi/linux/fib_rules.h

@@ -73,6 +73,8 @@ enum {
 	__FR_ACT_MAX,
 };
 
+#define FR_ACT_FAILED_POLICY FR_ACT_POLICY_FAILED
+
 #define FR_ACT_MAX (__FR_ACT_MAX - 1)
 
 #endif

include/uapi/linux/icmpv6.h

@@ -118,6 +118,8 @@ struct icmp6hdr {
 #define ICMPV6_POLICY_FAIL		5
 #define ICMPV6_REJECT_ROUTE		6
 
+#define ICMPV6_FAILED_POLICY		ICMPV6_POLICY_FAIL
+
 /*
  *	Codes for Time Exceeded
  */

include/uapi/linux/rtnetlink.h

@@ -219,6 +219,8 @@ enum {
 	__RTN_MAX
 };
 
+#define RTN_FAILED_POLICY RTN_POLICY_FAILED
+
 #define RTN_MAX (__RTN_MAX - 1)