fix Makefile chmod (644)
replace MD5SUM with HASH
add PKG_MIRROR_HASH when PKG_SOURCE_PROTO:=git

(PKG_SOURCE_PROTO:=svn tarballs are not reproducible for now)

Signed-off-by: Etienne Champetier <champetier.etienne@gmail.com>

These changes are a direct copy of [1]. The original commit
messages were:

> commit 0a6411b56b
> Author: Matthias Schiffer <mschiffer@universe-factory.net>
> Date:   Sun May 8 11:39:22 2016 +0200
>
> ecdsautils: update to current git, add libecdsautil
>
> The addition of libecdsautil required us to switch from statically
> linked libuecc to a shared library (as we also want shared
> libecdsautil).

> commit 05bc59f319
> Author: Nils Schneider <nils@nilsschneider.net>
> Date:   Mon Jul 21 14:51:42 2014 +0200
>
> ecdsautils: update to v0.3.2

> commit db7d9410b3
> Author: Nils Schneider <nils@nilsschneider.net>
> Date:   Thu Jul 10 16:28:10 2014 +0200
>
> ecdsautils: download using git instead of http

> commit 3a1b6541b4
> Author: Nils Schneider <nils.schneider@gmail.com>
> Date:   Wed Feb 6 13:30:26 2013 +0100
>
> Add ecdsautils v0.2

[1]: 0a6411b56b/utils/ecdsautils/Makefile

Signed-off-by: Dominik Menke <dom@digineo.de>