Unrolled build for rust-lang#126254

Rollup merge of rust-lang#126254 - ferrocene:lw-ignore-cross, r=pietroalbini

Remove ignore-cross-compile directive from ui/macros/proc_macro

All the other proc-macro tests don't have this, presumably this was forgotten when the restriction got lifted as it does test just fine

r? `@pietroalbini`

tests/ui/macros/proc_macro.rs

@@ -1,6 +1,5 @@
 //@ run-pass
 //@ aux-build:proc_macro_def.rs
-//@ ignore-cross-compile
 
 extern crate proc_macro_def;