Fixed C++ Builder 5 support,

Fixed support for bidirectional iterators,
Fixed enum declaration in states.hpp.


[SVN r18874]

libs/regex

@@ -1 +1 @@
-Subproject commit 6f9ba7a2899e6662a66c2eca4abd5dc99a1c0577
+Subproject commit 4a851cf958da6fddb474ec22b53100abe2afb26c