Probable fix for http://mail.kde.org/pipermail/taglib-devel/2013-July/00...

...2516.html

As stated in the mail (http://mail.kde.org/pipermail/taglib-devel/2013-July/002516.html) MSVS doesn't seem to compile ebmlmatroskafile.cpp. Unfortunately I do not have MSVS, therefore I'm unable to check, whether this patch fixed the issue.

A note to the matroska/ebml implementation. As stated in https://github.com/taglib/taglib/pull/217, I wasn't able to debug the code but I could confirm the issue. But since TsudaKageyu suggested to separate the `Tag` from the `File` implementation, I'm thinking about rewriting the whole implementation. Unfortunately I currently do not have much time.