Patched erlang pubkey to make use of SmartOS default CA location

[brianewell]

Added /etc/ssl/certs/ca-certificates.crt to the CA cert search path for any platforms that identify as SunOS, which corrects the following error when attempting to use mix to download any libraries or dependencies:

# mix local.hex

20:25:04.589 [error] Task #PID<0.104.0> started from #PID<0.94.0> terminating
** (FunctionClauseError) no function clause matching in :pubkey_os_cacerts.conv_error_reason/1
    (public_key 1.21.2) pubkey_os_cacerts.erl:301: :pubkey_os_cacerts.conv_error_reason(:no_cacerts_found)
    (public_key 1.21.2) pubkey_os_cacerts.erl:56: :pubkey_os_cacerts.get/0
    (mix 1.20.2) lib/mix/utils.ex:883: Mix.Utils.read_httpc/1
    (mix 1.20.2) lib/mix/utils.ex:808: anonymous fn/2 in Mix.Utils.read_path/2
    (elixir 1.20.2) lib/task/supervised.ex:105: Task.Supervised.invoke_mfa/2
    (elixir 1.20.2) lib/task/supervised.ex:40: Task.Supervised.reply/4
Function: #Function<8.68880737/0 in Mix.Utils.read_path/2>
    Args: []
** (EXIT from #PID<0.94.0>) an exception was raised:
    ** (FunctionClauseError) no function clause matching in :pubkey_os_cacerts.conv_error_reason/1
        (public_key 1.21.2) pubkey_os_cacerts.erl:301: :pubkey_os_cacerts.conv_error_reason(:no_cacerts_found)
        (public_key 1.21.2) pubkey_os_cacerts.erl:56: :pubkey_os_cacerts.get/0
        (mix 1.20.2) lib/mix/utils.ex:883: Mix.Utils.read_httpc/1
        (mix 1.20.2) lib/mix/utils.ex:808: anonymous fn/2 in Mix.Utils.read_path/2
        (elixir 1.20.2) lib/task/supervised.ex:105: Task.Supervised.invoke_mfa/2
        (elixir 1.20.2) lib/task/supervised.ex:40: Task.Supervised.reply/4