Update to the latest LTS version so it's available in case something
has to be rebuilt against openssl (this version doesn't bring anything):

Major changes between OpenSSL 1.0.2k and OpenSSL 1.0.2l [25 May 2017]

• config now recognises 64-bit mingw and chooses mingw64 instead of mingw

Signed-off-by: Pierre-Yves <pyu@riseup.net>

Tested a few commands like :
openssl s_client -connect smtp.gmail.com:587 -starttls smtp
to make sure it's working fine.