Can't build on current nightly, due to changes in variadic support

[RoganDawes]

armbian@armbian-build:~/proxychains-rs$ rustup toolchain install nightly
info: syncing channel updates for 'nightly-x86_64-unknown-linux-gnu'

  nightly-x86_64-unknown-linux-gnu unchanged - rustc 1.97.0-nightly (c935696dd 2026-04-29)

armbian@armbian-build:~/proxychains-rs$ rustup run nightly cargo build -p proxychains_rs --release
    Updating crates.io index
  Downloaded dtor v0.1.1
  Downloaded cc v1.2.47
  Downloaded find-msvc-tools v0.1.5
  Downloaded libc v0.2.177
  Downloaded shlex v1.3.0
  Downloaded ctor-proc-macro v0.0.7
  Downloaded dtor-proc-macro v0.0.6
  Downloaded ctor v0.6.1
  Downloaded 8 crates (949.9KiB) in 1.20s
   Compiling dtor-proc-macro v0.0.6
   Compiling libc v0.2.177
   Compiling ctor-proc-macro v0.0.7
   Compiling dtor v0.1.1
   Compiling ctor v0.6.1
   Compiling proxychains_rs v5.0.0 (/home/armbian/proxychains-rs)
error[E0425]: cannot find type `VaListImpl` in module `::core::ffi`
   --> src/core.rs:572:35
    |
572 |     let mut arglist: ::core::ffi::VaListImpl;
    |                                   ^^^^^^^^^^ not found in `::core::ffi`

For more information about this error, try `rustc --explain E0425`.
error: could not compile `proxychains_rs` (lib) due to 1 previous error

I was able to get it to build with the following diff, but I have no idea if it is correct or not :-)

diff --git a/src/core.rs b/src/core.rs
index 08f76db..c07999e 100644
--- a/src/core.rs
+++ b/src/core.rs
@@ -569,14 +569,14 @@ unsafe extern "C" fn encode_base_64(
 #[no_mangle]
 pub unsafe extern "C" fn proxychains_write_log(mut str: *mut core::ffi::c_char, mut args: ...) {
     let mut buff: [core::ffi::c_char; 4096] = [0; 4096];
-    let mut arglist: ::core::ffi::VaListImpl;
+    let mut arglist: ::core::ffi::VaList;
     if proxychains_quiet_mode == 0 {
         arglist = args.clone();
         vsnprintf(
             buff.as_mut_ptr(),
             ::core::mem::size_of::<[core::ffi::c_char; 4096]>() as size_t,
             str,
-            arglist.as_va_list(),
+            arglist,
         );
         fprintf(
             stderr,