Revert https://github.com/rust-lang/rust/commit/68034f837a39387e49fc7d7c5b088f5372a1127e for rust 1.84.0

Revert-Disable-Zdual-proc-macros-if-the-target-doesn.patch

diff --git a/src/bootstrap/src/core/builder/cargo.rs b/src/bootstrap/src/core/builder/cargo.rs
index 0688a1d6892..8ec9747af5c 100644
--- a/src/bootstrap/src/core/builder/cargo.rs
+++ b/src/bootstrap/src/core/builder/cargo.rs
@@ -643,24 +643,10 @@ fn cargo(
         match mode {
             Mode::Std | Mode::ToolBootstrap | Mode::ToolStd => {}
             Mode::Rustc | Mode::Codegen | Mode::ToolRustc => {
-                // Build proc macros both for the host and the target unless proc-macros are not
-                // supported by the target.
+                // Build proc macros both for the host and the target
                 if target != compiler.host && cmd_kind != Kind::Check {
-                    let error = command(self.rustc(compiler))
-                        .arg("--target")
-                        .arg(target.rustc_target_arg())
-                        .arg("--print=file-names")
-                        .arg("--crate-type=proc-macro")
-                        .arg("-")
-                        .run_capture(self)
-                        .stderr();
-                    let not_supported = error
-                        .lines()
-                        .any(|line| line.contains("unsupported crate type `proc-macro`"));
-                    if !not_supported {
-                        cargo.arg("-Zdual-proc-macros");
-                        rustflags.arg("-Zdual-proc-macros");
-                    }
+                    cargo.arg("-Zdual-proc-macros");
+                    rustflags.arg("-Zdual-proc-macros");
                 }
             }
         }