Ignore extra MCUs and toolchains in get_config.py

Author: theotherjimmy

tools/get_config.py

@@ -49,12 +49,12 @@
     # Target
     if options.mcu is None :
         args_error(parser, "[ERROR] You should specify an MCU")
-    target = options.mcu
+    target = options.mcu[0]
 
     # Toolchain
     if options.tool is None:
         args_error(parser, "[ERROR] You should specify a TOOLCHAIN")
-    toolchain = options.tool
+    toolchain = options.tool[0]
 
     options.prefix = options.prefix or [""]