6.0.5 doesn't build

[dmd]

6.0.5 has three problems:

1. stretch updates no longer exists - line needs to be removed from sources.list
2. stretch now lives at archive.debian.org
3. The fsl installer no longer works with 6.0.5:

New installer file does not match expected checksum! Skipping update.
An error has occurred: FSL version "6.0.5" is not available - available versions: 6.0.7, 6.0.6, 6.0.7.1, 6.0.7.2, 6.0.7.3, 6.0.7.4, 6.0.7.5, 6.0.7.6, 6.0.7.7, 6.0.6.5, 6.0.6.4, latest, 6.0.6.1, 6.0.6.3, 6.0.6.2