uboot-mxs: Fix build with libressl 2.7.2
authorHauke Mehrtens <hauke@hauke-m.de>
Sat, 28 Apr 2018 22:40:40 +0000 (00:40 +0200)
committerHauke Mehrtens <hauke@hauke-m.de>
Sat, 28 Apr 2018 22:57:36 +0000 (00:57 +0200)
When libressl was linked the libpthread was missing, add it in addition.
Also make the mxsimage tool to use the OpenSSL 1.1 API for the recent
libressl version.

Fixes: 2c192b69163f ("tools/libressl: update to version 2.7.2")
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

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