beastpatcher: check WMP version.

The current implementation fails silently if Windows Media Player is version
10. Add a check and inform the user if the version installed is too old to work
properly with beastpatcher.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@30864 a1c6a512-1295-4272-9138-f99709370657
3 files changed