src: use C++14 deprecated attribute for NODE_DEPRECATED

This has been standardized for a while, so there's no real
reason not to just use it over compiler-specific alternatives.

Signed-off-by: Anna Henningsen <anna@addaleax.net>
PR-URL: #63755
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Chengzhong Wu <legendecas@gmail.com>

Author: addaleax

src/node.h

@@ -111,15 +111,7 @@
 #if defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS
 # define NODE_DEPRECATED(message, declarator) declarator
 #else  // NODE_WANT_INTERNALS
-# if NODE_CLANG_AT_LEAST(2, 9, 0) || NODE_GNUC_AT_LEAST(4, 5, 0)
-#  define NODE_DEPRECATED(message, declarator)                                 \
-    __attribute__((deprecated(message))) declarator
-# elif defined(_MSC_VER)
-#  define NODE_DEPRECATED(message, declarator)                                 \
-    __declspec(deprecated) declarator
-# else
-#  define NODE_DEPRECATED(message, declarator) declarator
-# endif
+#define NODE_DEPRECATED(message, declarator) [[deprecated(message)]] declarator
 #endif
 
 // Forward-declare libuv loop