When decoding syncsafe integers, assume non-syncsafe integers are written by...

When decoding syncsafe integers, assume non-syncsafe integers are written by buggy software and treat them as normal integers.
From Songbird bug 12964, original author Mike Smith (msmith@songbirdnest.com)

git-svn-id: svn://anonsvn.kde.org/home/kde/trunk/kdesupport/taglib@1056922 283d02a7-25f6-0310-bc7c-ecb5cbfe19da