move unprefixed error into .c file

Include/compile.h

@@ -33,8 +33,6 @@ PyAPI_FUNC(PyCodeObject *) PyAST_Compile(struct _mod *, const char *,
 					PyCompilerFlags *, PyArena *);
 PyAPI_FUNC(PyFutureFeatures *) PyFuture_FromAST(struct _mod *, const char *);
 
-#define ERR_LATE_FUTURE \
-"from __future__ imports must occur at the beginning of the file"
 
 #ifdef __cplusplus
 }

Python/future.c

@@ -8,6 +8,8 @@
 #include "symtable.h"
 
 #define UNDEFINED_FUTURE_FEATURE "future feature %.100s is not defined"
+#define ERR_LATE_FUTURE \
+"from __future__ imports must occur at the beginning of the file"
 
 static int
 future_check_features(PyFutureFeatures *ff, stmt_ty s, const char *filename)