gh-123961: move PyCursesError in _cursesmodule.c to a global state variable

Include/py_curses.h

@@ -81,8 +81,6 @@ typedef struct {
  char *encoding;
 } PyCursesWindowObject;
 
-#define PyCursesWindow_Check(v) Py_IS_TYPE((v), &PyCursesWindow_Type)
-
 #define PyCurses_CAPSULE_NAME "_curses._C_API"
 
 
@@ -99,6 +97,8 @@ static void **PyCurses_API;
 #define PyCursesInitialised {if (! ((int (*)(void))PyCurses_API[2]) () ) return NULL;}
 #define PyCursesInitialisedColor {if (! ((int (*)(void))PyCurses_API[3]) () ) return NULL;}
 
+#define PyCursesWindow_Check(v) Py_IS_TYPE((v), &PyCursesWindow_Type)
+
 #define import_curses() \
  PyCurses_API = (void **)PyCapsule_Import(PyCurses_CAPSULE_NAME, 1);