Add no_std compatibility and x86_64 crate helper

[alesharik]

This PR:

• Adds no_std compatibility to this library
• Adds method to find smbios entry in raw memory using x86_64 crate

[YtvwlD]

This would be really cool to have, but it doesn't actually work, does it? I tried your main branch because seems to be newer and the build fails because serde still gets built with the std feature.

Edit: Oh, the master branch works. Sorry about that. So, it would be great if this could be merged.

[jczuluag]

This would be really cool to have, but it doesn't actually work, does it? I tried your main branch because seems to be newer and the build fails because serde still gets built with the std feature.

Edit: Oh, the master branch works. Sorry about that. So, it would be great if this could be merged.

Oh cool. I think we need to bring it to the master branch. @jrgerber, it feels like we need to help here. Let me know how we can proceed.

[YtvwlD]

Ah, great. By the way: I think it's more common to name the feature std and make it default instead of naming it no_std.

[jczuluag]

Ah, great. By the way: I think it's more common to name the feature std and make it default instead of naming it no_std.

hmm, it is more like a no_std way, since it tries to avoid using the std crate. Just a heads up: I've been trying to merge with the current main branch, but there are a lot of issue with this fork/branch, given the fact that there is a lot of functionality that depends on std crate. So it is not building for all the cases unfortunately. More work is required in order to be integrated fully.

[YtvwlD]

Ok, I've just used the EntryPoints. They seem to work.

[YtvwlD]

It breaks with QEMU 8.1, sadly, because it uses SMBIOS3 and https://github.com/jrgerber/smbios-lib/commit/812920b9a80035c8c6976812a1a6c8269d52d3b8 isn't in here.

#105 sadly doesn't work with no_std, because there are still tons on std references.