Added latest version of dbghelp.dll (from microsoft debugger package), to prevent Windows from loading other, outdated versions.
This caused the dbghelpplug plugin to omit information about structures when producing a backtrace.

git-svn-id: https://svn.code.sf.net/p/rathena/svn/trunk@12453 54d463be-8e91-2dee-dedb-b68131a5f0ec