stop linting [blocks_in_conditions] on match on proc macros

tests/ui/blocks_in_conditions.fixed

@@ -104,7 +104,7 @@ fn issue_12162() {
 mod issue_12016 {
     #[proc_macro_attr::fake_desugar_await]
     pub async fn await_becomes_block() -> i32 {
-        let res = await; match res {
+        match Some(1).await {
             Some(1) => 2,
             Some(2) => 3,
             _ => 0,

tests/ui/blocks_in_conditions.stderr

@@ -53,11 +53,5 @@ LL +         opt
 LL ~     }; match res {
    |
 
-error: in a `match` scrutinee, avoid complex blocks or closures with blocks; instead, move the block or closure higher and bind it with a `let`
-  --> $DIR/blocks_in_conditions.rs:107:9
-   |
-LL |         match Some(1).await {
-   |         ^^^^^^^^^^^^^^^^^^^ help: try: `let res = await; match res`
-
-error: aborting due to 5 previous errors
+error: aborting due to 4 previous errors