benchmark: eina: remove outdated ecore_hash

benchmark: eina: remove outdated ecore_hash

Ecore_hash is an ancestor of eina_hash and not used anywhere anymore.
We simply forgot to remove it from our benchmark utility.

Together with ecore_hash we are removing ecore_strings, which uses it,
and the corresponding benchmark files.

Signed-off-by: Stefan Schmidt <s.schmidt@samsung.com>
Reviewed-by: Marcel Hollerbach <mail@marcel-hollerbach.de>
Differential Revision: https://phab.enlightenment.org/D12042