Fix build with llvm-19

https://github.com/GNUAspell/aspell/pull/650

Index: modules/speller/default/vector_hash-t.hpp
--- modules/speller/default/vector_hash-t.hpp.orig
+++ modules/speller/default/vector_hash-t.hpp
@@ -183,7 +183,7 @@ namespace aspeller {
   template<class Parms>
   void VectorHashTable<Parms>::recalc_size() {
     size_ = 0;
-    for (iterator i = begin(); i != this->e; ++i, ++this->_size);
+    for (iterator i = begin(), e = end(); i != e; ++i, ++size_);
   }
 
 }
