MPEG::File::save() ignores tag()->header()->setMajorVersion()

[Anton Sergunov]

Fixed realy strange behavior

TagLib::MPEG::FileRef fref(filename); // .mp3 file without any tags
TagLib::MPEG::File* file = fref.file();
TagLib::ID3v2::Tag *tag = file->ID3v2Tag();
ASSERT(tag);
tag->header()->setMajorVersion(3); // !!!
// set other tag fields
fref.save();

Got ID3v2.4 tags in file.

PS. Also added constructor MP4::Tag::Tag()

PPS. Please do thomthing to make it compilable under mingw (about
isWritable()/isReadable())
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