Remove redundant include in file.c

* Remove include mpconfigport.h from file.c

stm/file.c

@@ -3,7 +3,6 @@
 
 #include "misc.h"
 #include "mpconfig.h"
-#include "mpconfigport.h"
 #include "qstr.h"
 #include "obj.h"
 #include "file.h"