fixes submodules

Author: kdschlosser

builder/esp32.py

@@ -762,8 +762,9 @@ def submodules():
     env, cmds = setup_idf_environ()
 
     wifi_lib = os.path.abspath(os.path.join(idf_path, 'components/esp_wifi/lib'))
-    if not os.path.exists(wifi_lib):
+    berkeley_db = os.path.abspath('lib/micropython/lib/berkeley-db-1.xx/README')
 
+    if not os.path.exists(berkeley_db) or not os.path.exists(wifi_lib):
         cmds.append(submodules_cmd)
 
         return_code, _ = spawn(cmds, env=env)