Marked strdup() as deprecated (issue #658)

test/DynamicJsonBuffer/CMakeLists.txt

@@ -9,7 +9,6 @@ add_executable(DynamicJsonBufferTests
 	no_memory.cpp
 	size.cpp
 	startString.cpp
-	strdup.cpp
 )
 
 target_link_libraries(DynamicJsonBufferTests catch)

test/DynamicJsonBuffer/strdup.cpp

@@ -1,23 +0,0 @@
-// ArduinoJson - arduinojson.org
-// Copyright Benoit Blanchon 2014-2018
-// MIT License
-
-#include <ArduinoJson.h>
-#include <catch.hpp>
-
-TEST_CASE("DynamicJsonBuffer::strdup()") {
-  DynamicJsonBuffer buffer;
-
-  SECTION("Should return a copy") {
-    char original[] = "hello";
-    const char* copy = buffer.strdup(original);
-    strcpy(original, "world");
-    REQUIRE(std::string("hello") == copy);
-  }
-
-  SECTION("Given NULL, return NULL") {
-    const char* original = NULL;
-    const char* copy = buffer.strdup(original);
-    REQUIRE(0 == copy);
-  }
-}