Avoid nightly regression by using older nightly (#338)

nightly-2023-12-15 breaks compilation of native applets by having
symbols from `compiler_builtins` conflict between the applet static
library and the platform during linking. This was not the case with
nightly-2023-11-14.

This rollback is temporary until
rust-lang/rust#118609 is fixed or provides
guidance on how to address this issue. Currently the only work-arounds
are:

- Compile the applet to an object file (like `applet.o`) and let the
platform link all the dependencies of the applet. This is not obvious to
do generically at the moment.

- Require applets that need to compile natively to directly depend on
`compiler_builtins` with the `weak-intrinsics` feature. If the
dependency could been indirect, the prelude would have been the perfect
place to introduce it. But given the dependency must be direct, this
adds a small burden on applets.

Author: ia0

crates/prelude/CHANGELOG.md

@@ -113,4 +113,4 @@
 
 ## 0.1.0
 
-<!-- Increment to skip CHANGELOG.md test: 19 -->
+<!-- Increment to skip CHANGELOG.md test: 20 -->

crates/prelude/src/callback.rs

@@ -20,7 +20,7 @@ macro_rules! define {
     (#[$m:meta] $n:ident $(, $x:ident)*) => {
         #[$m] #[no_mangle]
         extern "C" fn $n (
-            ptr: extern "C" fn(*const u8 $(, usize ${ignore($x)})*),
+            ptr: extern "C" fn(*const u8 $(, usize ${ignore(x)})*),
             this: *const u8 $(, $x: usize)*
         ) {
             ptr(this $(, $x)*);

rust-toolchain.toml

@@ -1,5 +1,5 @@
 [toolchain]
-channel = "nightly-2023-12-15"
+channel = "nightly-2023-11-14"
 components = ["clippy", "llvm-tools", "rust-src", "rustfmt"]
 targets = [
   "i686-unknown-linux-gnu",