[Bug 56735] Rekordbox: Mark drive as external to support library export/sync

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=56735

--- Comment #3 from Johannes Pfau  ---
For all those who just want to run RekordBox with USB export, I've uploaded
patched GE Proton-8.26 binaries here:
https://github.com/jpf91/proton-wine/releases/tag/rekordbox_1

If you don't want to accept binaries from random strangers on the internet, the
release page also provides a simple 3-command description to build from source
:-)