Only include wchar.h in PUGIXML_WCHAR_MODE; use a custom implementation of wcslen in case there is no wide character support.
Only include wchar.h in PUGIXML_WCHAR_MODE; use a custom implementation of wcslen in case there is no wide character support.

git-svn-id: febc13fe83507aab7d46ca3748413bb6c67ab8eb@942 99668b35-9821-0410-8761-19e4c4f06640

zeux/pugixml,zeux/pugixml,zeux/pugixml,zeux/pugixml