t0410: mark test with SHA1 prerequisite

t0410: mark test with SHA1 prerequisite

These tests try to check that we behave properly if we encounter a
repository with version 0 but an extension.  This is a laudable goal,
but the test cannot work with SHA-256, since SHA-256 repositories always
have an existing extension and are never version 0.

Add a SHA1 prerequisite to these tests.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Reviewed-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>