diffutils: Update to version 3.12

diffutils: Update to version 3.12

- Update from version 3.11 to 3.12
- Update of rootfile not required
- Changelog
    3.12
	Bug fixes
	  diff -r no longer merely summarizes when comparing an empty regular
	   file to a nonempty regular file.
	   [bug#76452 introduced in 3.11]
	  diff -y no longer crashes when given nontrivial differences.
	   [bug#76613 introduced in 3.11]

Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>