fix lwip2 ping internal library

related: dancol90/ESP8266Ping#42
esp8266 · mcspr · Jun 14, 2022 · Jun 10, 2022 · Jun 14, 2022 · Jun 10, 2022
commit 6c52e8f95fb0bbaf4ee345da30593d7dd86d08cf
diff --git a/tools/sdk/lib/liblwip2-1460-feat.a b/tools/sdk/lib/liblwip2-1460-feat.a
diff --git a/tools/sdk/lib/liblwip2-1460.a b/tools/sdk/lib/liblwip2-1460.a
diff --git a/tools/sdk/lib/liblwip2-536-feat.a b/tools/sdk/lib/liblwip2-536-feat.a
diff --git a/tools/sdk/lib/liblwip2-536.a b/tools/sdk/lib/liblwip2-536.a
diff --git a/tools/sdk/lib/liblwip6-1460-feat.a b/tools/sdk/lib/liblwip6-1460-feat.a
diff --git a/tools/sdk/lib/liblwip6-536-feat.a b/tools/sdk/lib/liblwip6-536-feat.a
diff --git a/tools/sdk/lwip2/builder b/tools/sdk/lwip2/builder
diff --git a/tools/sdk/lwip2/include/lwip-git-hash.h b/tools/sdk/lwip2/include/lwip-git-hash.h
@@ -1,5 +1,5 @@
 // generated by makefiles/make-lwip2-hash
 #ifndef LWIP_HASH_H
 #define LWIP_HASH_H
-#define LWIP_HASH_STR "STABLE-2_1_3_RELEASE/glue:1.2-61-g679577b"
+#define LWIP_HASH_STR "STABLE-2_1_3_RELEASE/glue:1.2-63-gb5def38"
 #endif // LWIP_HASH_H
diff --git a/tools/sdk/lwip2/include/lwip/arch.h b/tools/sdk/lwip2/include/lwip/arch.h
@@ -190,7 +190,7 @@ typedef uintptr_t mem_ptr_t;
  * sys/types or unistd.h are available).
  * Being like that, we define it to 'int' if SSIZE_MAX is not defined.
  */
-#if !defined(SSIZE_MAX) || !defined(_SSIZE_T_DECLARED)
+#ifdef SSIZE_MAX
 /* If SSIZE_MAX is defined, unistd.h should provide the type as well */
 #ifndef LWIP_NO_UNISTD_H
 #define LWIP_NO_UNISTD_H 0