git-gui: search for all current SSH key types
OpenSSH has supported
Ed25519 keys since version 6.4 (2014-01-30), and
ECDSA keys since version 5.7 (2011-01-24). git-gui fails to find these
key types in its Help/Show SSH Key dialog.
Teach git-gui to show
Ed25519 and ECDSA keys as well.
This was originally reported in
https://github.com/git-for-windows/git/issues/1487 and subseqently in
https://public-inbox.org/git/
F65780F29E48994380E2BCE87C6F071101146AB1@DEERLM99EX2MSX.ww931.my-it-solutions.net/
Signed-off-by: Beat Bolli <dev+git@drbeat.li>
Signed-off-by: Junio C Hamano <gitster@pobox.com>