rewrite c-unwind-abi-catch-panic to rmake

src/tools/tidy/src/allowed_run_make_makefiles.txt

@@ -4,7 +4,6 @@ run-make/c-dynamic-rlib/Makefile
 run-make/c-static-dylib/Makefile
 run-make/c-static-rlib/Makefile
 run-make/c-unwind-abi-catch-lib-panic/Makefile
-run-make/c-unwind-abi-catch-panic/Makefile
 run-make/cat-and-grep-sanity-check/Makefile
 run-make/cdylib-dylib-linkage/Makefile
 run-make/compiler-lookup-paths-2/Makefile

tests/run-make/c-unwind-abi-catch-panic/Makefile

@@ -1,10 +0,0 @@
-# Exercise unwinding a panic. This catches a panic across an FFI boundary and downcasts it into an integer. The Rust code that panics is in the same directory.
-# See https://github.com/rust-lang/rust/commit/baf227ea0c1e07fc54395a51e4b3881d701180cb
-
-# ignore-cross-compile
-# needs-unwind
-include ../tools.mk
-
-all: $(call NATIVE_STATICLIB,add)
-	$(RUSTC) main.rs
-	$(call RUN,main) || exit 1

tests/run-make/c-unwind-abi-catch-panic/rmake.rs

@@ -0,0 +1,18 @@
+// A test for calling `C-unwind` functions across foreign function boundaries (FFI).
+// This test triggers a panic when calling a foreign function that calls *back* into Rust.
+// This catches a panic across an FFI boundary and downcasts it into an integer.
+// The Rust code that panics is in the same directory, unlike `c-unwind-abi-catch-lib-panic`.
+// See https://github.com/rust-lang/rust/pull/76570
+
+//@ ignore-cross-compile
+// Reason: the compiled binary is executed
+//@ needs-unwind
+// Reason: this test exercises panic unwinding
+
+use run_make_support::{build_native_static_lib, run, rustc};
+
+fn main() {
+    build_native_static_lib("add");
+    rustc().input("main.rs").run();
+    run("main");
+}