sawman: completely remove the package
In commit 11573f5a14d1c2726ce9623de3a5f118085a420f ("sawman: remove
package"), we removed the sawman package, but forgot to remove the
hash file of that package. This commit finalizes the removal by
getting rid of the hash file.
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>