package/swugenerator: bump to version 0.3

Upstream github tarball dropped prefix "v" while releasing version 0.3
so let's drop it in swugenerator.mk as well.

Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
2 files changed