Add no_std support

[CrazyboyQCD]

Based on #253.

[grovesNL]

@CrazyboyQCD it looks like catch_unwind isn't needed anymore for this callback as of Rust 1.81, so we can remove it entirely (https://blog.rust-lang.org/2024/09/05/Rust-1.81.0.html#abort-on-uncaught-panics-in-extern-c-functions) and keep the code the same between std and no_std

[bushrat011899]

This is great! Just a couple small suggestions which would help with wgpu/#6826, specifically to get wasm32v1-none

[bushrat011899]

Brilliant! I've confirmed this works on wasm32v1-none. One last suggestion: if you apply the below diff, then no_std will also work on native targets, like x86_64-unknown-none:

diff --git a/src/gl46.rs b/src/gl46.rs
index 83d416a..1d259a6 100644
--- a/src/gl46.rs
+++ b/src/gl46.rs
@@ -116,16 +116,7 @@
 //! * Individual GL commands are generally safe to use once they've been properly loaded for the current context, but this crate doesn't attempt to sort out what is safe and what's not. All GL commands are blanket marked as being `unsafe`.
 //! It's up to you to try and manage this unsafety! Sorry, but this crate just does what you tell it to.
 
-#[cfg(any(
-    all(
-        not(feature = "log"),
-        any(feature = "debug_trace_calls", feature = "debug_automatic_glGetError")
-    ),
-    not(feature = "chlorine"),
-))]
-extern crate std;
-
-use std::os::raw::*;
+use core::ffi::*;
 
 #[cfg(feature = "log")]
 #[allow(unused)]

[bushrat011899]

Confirmed working on x86_64-unknown-none!

[CrazyboyQCD]

@grovesNL
As no_std support changes the gl46.rs, and it is generated from script, it will be better to update it in the future.