feat: make libcrypto and libssl paths overrideable

[nydragon]

Allows overriding libcrypto and libssl paths by setting ACSM_LIBCRYPTO and ACSM_LIBSSL (both are necessary).

This is necessary to properly use the plugin on NixOS where library paths change quite frequently and are not necessarily in the scope of an application.

related to #68
closes #94

[ThePinkUnicorn6]

Thank you for this, works perfectly for me 👍

[Leseratte10]

Huh, sorry, I seem to have missed this merge request.

I've never used NixOS so I'm not sure how this works / why it's necessary, but given that the issue report has four upvotes, the code looks sensible and someone else confirmed it's working, I see no reason to not merge it.

Thanks.

[nydragon]

Huh, sorry, I seem to have missed this merge request.

I've never used NixOS so I'm not sure how this works / why it's necessary, but given that the issue report has four upvotes, the code looks sensible and someone else confirmed it's working, I see no reason to not merge it.

Thanks.

Thank you! I guess it would also find uses in trying out libraries that arent in the default path

[nydragon]

@Leseratte10 Would you mind if I submit a PR explaining the install/use process for NixOS?