Fix for latest esp8266 Arduino

Author: plerup

Diff for: tools/parse_arduino.pl

@@ -57,6 +57,7 @@ sub multi_com {
 $vars{'build.variant.path'} = '$(ESP_ROOT)/variants/' . $board;
 $vars{'runtime.os'} = '$(OS)';
 $vars{'build.fqbn'} = 'generic';
+$vars{'_id'} = $board;
 
 # Parse the files and define the corresponding variables
 my $board_defined;