Fix a harmless compiler warning.

FossilOrigin-Name: 608ab4ac1911d5f32a17ea043bd5f0748598691d
diff --git a/src/sqliteInt.h b/src/sqliteInt.h
index 4f0055c..f1658d1 100644
--- a/src/sqliteInt.h
+++ b/src/sqliteInt.h
@@ -3405,7 +3405,9 @@
 int sqlite3ExprIsConstantNotJoin(Expr*);
 int sqlite3ExprIsConstantOrFunction(Expr*, u8);
 int sqlite3ExprIsTableConstant(Expr*,int);
+#ifdef SQLITE_ENABLE_CURSOR_HINTS
 int sqlite3ExprContainsSubquery(Expr*);
+#endif
 int sqlite3ExprIsInteger(Expr*, int*);
 int sqlite3ExprCanBeNull(const Expr*);
 int sqlite3ExprNeedsNoAffinityChange(const Expr*, char);