crypto: Fix compile error for early LibreSSL
crypto: Fix compile error for early LibreSSL

There was a warning (treated as error) in the OTP/crypto if compiled with LibreSSL 2.1.5:
  error: implicit declaration of function ‘OpenSSL_version_num’ [-Werror=implicit-function-declaration]

It is also present in other early LibreSSL.

emacsmirror/erlang,rlipscombe/otp,g-andrade/otp,potatosalad/otp,mikpe/otp,vinoski/otp,dgud/otp,g-andrade/otp,vinoski/otp,dumbbell/otp,jj1bdx/otp,potatosalad/otp,rlipscombe/otp,potatosalad/otp,getong/otp,dumbbell/otp,bjorng/otp,isvilen/otp,jj1bdx/otp,rlipscombe/otp,vinoski/otp,erlang/otp,vinoski/otp,bjorng/otp,erlang/otp,dumbbell/otp,vinoski/otp,mikpe/otp,bjorng/otp,potatosalad/otp,dumbbell/otp,emacsmirror/erlang,isvilen/otp,bjorng/otp,erlang/otp,erlang/otp,getong/otp,bjorng/otp,erlang/otp,vinoski/otp,bjorng/otp,vinoski/otp,bjorng/otp,getong/otp,dgud/otp,g-andrade/otp,jj1bdx/otp,getong/otp,isvilen/otp,getong/otp,dgud/otp,emacsmirror/erlang,dgud/otp,potatosalad/otp,isvilen/otp,mikpe/otp,emacsmirror/erlang,rlipscombe/otp,isvilen/otp,isvilen/otp,g-andrade/otp,rlipscombe/otp,g-andrade/otp,emacsmirror/erlang,dumbbell/otp,dgud/otp,jj1bdx/otp,rlipscombe/otp,g-andrade/otp,mikpe/otp,dumbbell/otp,dumbbell/otp,erlang/otp,erlang/otp,vinoski/otp,isvilen/otp,jj1bdx/otp,emacsmirror/erlang,mikpe/otp,jj1bdx/otp,jj1bdx/otp,dgud/otp,g-andrade/otp,erlang/otp,mikpe/otp,vinoski/otp,jj1bdx/otp,g-andrade/otp,getong/otp,dgud/otp,erlang/otp,potatosalad/otp,jj1bdx/otp,rlipscombe/otp,potatosalad/otp,dgud/otp,bjorng/otp,isvilen/otp,getong/otp,rlipscombe/otp,getong/otp,g-andrade/otp,potatosalad/otp,dgud/otp,jj1bdx/otp,erlang/otp,bjorng/otp,getong/otp,mikpe/otp,emacsmirror/erlang,vinoski/otp,g-andrade/otp,emacsmirror/erlang,dgud/otp,dumbbell/otp,potatosalad/otp,rlipscombe/otp,mikpe/otp,bjorng/otp,isvilen/otp,rlipscombe/otp,potatosalad/otp,mikpe/otp,emacsmirror/erlang,emacsmirror/erlang,dumbbell/otp,getong/otp,isvilen/otp,dumbbell/otp,mikpe/otp