signal.h: add MTE specific SIGSEGV codes from linux v5.10

add synchronouse and asynchronous tag check failure codes, see

  linux commit 74f1082487feb90bbf880af14beb8e29c3030c9f
  arm64: mte: Add specific SIGSEGV codes

include/signal.h

@@ -75,6 +75,8 @@ typedef struct sigaltstack stack_t;
 #define SEGV_ACCERR 2
 #define SEGV_BNDERR 3
 #define SEGV_PKUERR 4
+#define SEGV_MTEAERR 8
+#define SEGV_MTESERR 9
 
 #define BUS_ADRALN 1
 #define BUS_ADRERR 2