epee: fix serialization compile errors with Boost 1.85

1. `std::is_pod` is deprecated in C++20
2. `boost::uuids::uuid` is no longer a POD type in Boost 1.85
3. `std::is_pod` is technically wrong compile time check here anyways

Author: jeffro256

contrib/epee/include/serialization/keyvalue_serialization.h

@@ -98,16 +98,18 @@ public: \
 #define KV_SERIALIZE_VAL_POD_AS_BLOB_FORCE_N(varialble, val_name) \
   epee::serialization::selector<is_store>::serialize_t_val_as_blob(this_ref.varialble, stg, hparent_section, val_name); 
 
-#define KV_SERIALIZE_VAL_POD_AS_BLOB_N(varialble, val_name) \
-  static_assert(std::is_pod<decltype(this_ref.varialble)>::value, "t_type must be a POD type."); \
-  KV_SERIALIZE_VAL_POD_AS_BLOB_FORCE_N(varialble, val_name)
+#define KV_SERIALIZE_VAL_POD_AS_BLOB_N(variable, val_name) \
+  static_assert(std::is_trivially_copyable_v<decltype(this_ref.variable)>, "t_type must be a trivially copyable type."); \
+  static_assert(std::is_standard_layout_v<decltype(this_ref.variable)>, "t_type must be a standard layout type."); \
+  KV_SERIALIZE_VAL_POD_AS_BLOB_FORCE_N(variable, val_name)
 
-#define KV_SERIALIZE_VAL_POD_AS_BLOB_OPT_N(varialble, val_name, default_value) \
+#define KV_SERIALIZE_VAL_POD_AS_BLOB_OPT_N(variable, val_name, default_value) \
   do { \
-    static_assert(std::is_pod<decltype(this_ref.varialble)>::value, "t_type must be a POD type."); \
-    bool ret = KV_SERIALIZE_VAL_POD_AS_BLOB_FORCE_N(varialble, val_name) \
+    static_assert(std::is_trivially_copyable_v<decltype(this_ref.variable)>, "t_type must be a trivially copyable type."); \
+    static_assert(std::is_standard_layout_v<decltype(this_ref.variable)>, "t_type must be a standard layout type."); \
+    bool ret = KV_SERIALIZE_VAL_POD_AS_BLOB_FORCE_N(variable, val_name) \
     if (!ret) \
-      epee::serialize_default(this_ref.varialble, default_value); \
+      epee::serialize_default(this_ref.variable, default_value); \
   } while(0);
 
 #define KV_SERIALIZE_CONTAINER_POD_AS_BLOB_N(varialble, val_name) \
@@ -118,7 +120,7 @@ public: \
 #define KV_SERIALIZE(varialble)                           KV_SERIALIZE_N(varialble, #varialble)
 #define KV_SERIALIZE_VAL_POD_AS_BLOB(varialble)           KV_SERIALIZE_VAL_POD_AS_BLOB_N(varialble, #varialble)
 #define KV_SERIALIZE_VAL_POD_AS_BLOB_OPT(varialble, def)  KV_SERIALIZE_VAL_POD_AS_BLOB_OPT_N(varialble, #varialble, def)
-#define KV_SERIALIZE_VAL_POD_AS_BLOB_FORCE(varialble)     KV_SERIALIZE_VAL_POD_AS_BLOB_FORCE_N(varialble, #varialble) //skip is_pod compile time check
+#define KV_SERIALIZE_VAL_POD_AS_BLOB_FORCE(varialble)     KV_SERIALIZE_VAL_POD_AS_BLOB_FORCE_N(varialble, #varialble) //skip is_trivially_copyable and is_standard_layout compile time check
 #define KV_SERIALIZE_CONTAINER_POD_AS_BLOB(varialble)     KV_SERIALIZE_CONTAINER_POD_AS_BLOB_N(varialble, #varialble)
 #define KV_SERIALIZE_OPT(variable,default_value)          KV_SERIALIZE_OPT_N(variable, #variable, default_value)