expose PySTEntry.nested so the symtable module will work

Include/symtable.h

@@ -32,7 +32,7 @@ typedef struct _symtable_entry {
 	PyObject *ste_children;  /* list of child ids */
 	_Py_block_ty ste_type;   /* module, class, or function */
 	int ste_unoptimized;     /* false if namespace is optimized */
-	unsigned ste_nested : 1;      /* true if block is nested */
+	int ste_nested : ;      /* true if block is nested */
 	unsigned ste_free : 1;        /* true if block has free variables */
 	unsigned ste_child_free : 1;  /* true if a child block has free vars,
 				         including free refs to globals */

Python/symtable.c

@@ -112,6 +112,7 @@ static PyMemberDef ste_memberlist[] = {
 	{"symbols",  T_OBJECT, OFF(ste_symbols), READONLY},
 	{"varnames", T_OBJECT, OFF(ste_varnames), READONLY},
 	{"children", T_OBJECT, OFF(ste_children), READONLY},
+	{"nested",   T_INT,    OFF(ste_nested), READONLY},
 	{"type",     T_INT,    OFF(ste_type), READONLY},
 	{"lineno",   T_INT,    OFF(ste_lineno), READONLY},
 	{NULL}