HASHICORP_KEY_MANAGEMENT: MDEV-33420 post-fix

Compilation correction after MDEV-33420.

plugin/hashicorp_key_management/CMakeLists.txt

 FIND_PACKAGE(CURL)
 IF(NOT CURL_FOUND)
   # Can't build plugin
+  MESSAGE_ONCE(WARNING "Hashicorp Key Management plugin requires curl development package")
   RETURN()
 ENDIF()
 
+SET_PACKAGE_PROPERTIES(CURL PROPERTIES TYPE REQUIRED)
+
+INCLUDE_DIRECTORIES(${CURL_INCLUDE_DIRS})
+
 set(CPACK_RPM_hashicorp-key-management_PACKAGE_SUMMARY "Hashicorp Key Management plugin for MariaDB" PARENT_SCOPE)
 set(CPACK_RPM_hashicorp-key-management_PACKAGE_DESCRIPTION "This encryption plugin uses Hashicorp Vault for storing encryption
  keys for MariaDB Data-at-Rest encryption." PARENT_SCOPE)
 
 MYSQL_ADD_PLUGIN(HASHICORP_KEY_MANAGEMENT
   hashicorp_key_management_plugin.cc
-  LINK_LIBRARIES CURL::libcurl
+  LINK_LIBRARIES ${CURL_LIBRARIES}
   CONFIG hashicorp_key_management.cnf
   COMPONENT hashicorp-key-management
   MODULE_ONLY)

plugin/hashicorp_key_management/hashicorp_key_management_plugin.cc

@@ -987,7 +987,11 @@ int HCData::init ()
     bool not_equal= token_env != NULL && strcmp(token_env, token) != 0;
     if (token_env == NULL || not_equal)
     {
-      setenv("VAULT_TOKEN", token, 1);
+#if defined(HAVE_SETENV) || !defined(_WIN32)
+        setenv("VAULT_TOKEN", token, 1);
+#else
+        _putenv_s("VAULT_TOKEN", token);
+#endif
       if (not_equal)
       {
         my_printf_error(ER_UNKNOWN_ERROR, PLUGIN_ERROR_HEADER