testing/jdupes: Enable btrfs support

This tool doesn't enable btrfs support. It's fairly easy to enable.

# This can also be enabled at build time: 'make ENABLE_DEDUPE=1' or maybe make STATIC_DEDUPE_H=1

Edited May 30, 2020 by Iggy Jackson

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information