t: use hash-object --literally when created malformed objects

Many test scripts use hash-object to create malformed objects to see how
we handle the results in various commands. In some cases we already have
to use "hash-object --literally", because it does some rudimentary
quality checks. But let's use "--literally" more consistently to
future-proof these tests against hash-object learning to be more
careful.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t4058-diff-duplicates.sh

@@ -29,7 +29,7 @@ make_tree () {
 		make_tree_entry "$1" "$2" "$3"
 		shift; shift; shift
 	done |
-	git hash-object -w -t tree --stdin
+	git hash-object --literally -w -t tree --stdin
 }
 
 # this is kind of a convoluted setup, but matches