Merge pull request #8375 from kareem-wolfssl/zd19270

Fix warning about ESP_IDF_VERSION_MAJOR not being defined when defining FREERTOS.

Author: dgarske

wolfssl/wolfcrypt/wc_port.h

@@ -284,7 +284,7 @@
 #else /* MULTI_THREADED */
     /* FREERTOS comes first to enable use of FreeRTOS Windows simulator only */
     #if defined(FREERTOS)
-        #if ESP_IDF_VERSION_MAJOR >= 4
+        #if defined(ESP_IDF_VERSION_MAJOR) && (ESP_IDF_VERSION_MAJOR >= 4)
             typedef SemaphoreHandle_t wolfSSL_Mutex;
         #else
             typedef xSemaphoreHandle wolfSSL_Mutex;