esp8266/boards: Replace stackctrl.o with cstack.o in obj file list.

This was missed in d441788.

Signed-off-by: Damien George <[email protected]>

Author: dpgeorge

ports/esp8266/boards/esp8266_common.ld

@@ -93,6 +93,7 @@ SECTIONS
         *py/binary.o*(.literal* .text*)
         *py/builtin*.o*(.literal* .text*)
         *py/compile.o*(.literal* .text*)
+        *py/cstack.o*(.literal* .text*)
         *py/emit*.o*(.literal* .text*)
         *py/persistentcode*.o*(.literal* .text*)
         *py/formatfloat.o*(.literal* .text*)
@@ -121,7 +122,6 @@ SECTIONS
         *py/sequence.o*(.literal* .text*)
         *py/showbc.o*(.literal* .text*)
         *py/smallint.o*(.literal* .text*)
-        *py/stackctrl.o*(.literal* .text*)
         *py/stream.o*(.literal* .text*)
         *py/unicode.o*(.literal* .text*)
         *py/vm.o*(.literal* .text*)