ices/97193.rs: fixed with errors

[github-actions]

Issue: rust-lang/rust#97193

extern  {
    fn a(&mut self)  {
    fn b(buf: &Self) {
}

=== stdout ===
=== stderr ===
error: this file contains an unclosed delimiter
 --> /home/runner/work/glacier/glacier/ices/97193.rs:4:3
  |
1 | extern  {
  |         - unclosed delimiter
2 |     fn a(&mut self)  {
  |                      - unclosed delimiter
3 |     fn b(buf: &Self) {
  |                      - this delimiter might not be properly closed...
4 | }
  | - ^
  | |
  | ...as it matches this but it has different indentation

error: incorrect function inside `extern` block
 --> /home/runner/work/glacier/glacier/ices/97193.rs:2:8
  |
1 |   extern  {
  |   ------ `extern` blocks define existing foreign functions and functions inside of them cannot have a body
2 |       fn a(&mut self)  {
  |  ________^_____________-
  | |        |
  | |        cannot have a body
3 | |     fn b(buf: &Self) {
4 | | }
  | |__- help: remove the invalid body: `;`
  |
  = help: you might have meant to write a function accessible through FFI, which can be done by writing `extern fn` outside of the `extern` block
  = note: for more information, visit https://doc.rust-lang.org/std/keyword.extern.html

error: `self` parameter is only allowed in associated functions
 --> /home/runner/work/glacier/glacier/ices/97193.rs:2:10
  |
2 |     fn a(&mut self)  {
  |          ^^^^^^^^^ not semantically valid as function parameter
  |
  = note: associated functions are those in `impl` or `trait` definitions

error: aborting due to 3 previous errors

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