Remove the x86_64-rumprun-netbsd target

Closes rust-lang#81514

Author: nagisa

std/src/sys/unix/stack_overflow.rs

@@ -34,7 +34,7 @@ impl Drop for Handler {
     target_os = "freebsd",
     target_os = "solaris",
     target_os = "illumos",
-    all(target_os = "netbsd", not(target_vendor = "rumprun")),
+    target_os = "netbsd",
     target_os = "openbsd"
 ))]
 mod imp {
@@ -218,7 +218,7 @@ mod imp {
     target_os = "freebsd",
     target_os = "solaris",
     target_os = "illumos",
-    all(target_os = "netbsd", not(target_vendor = "rumprun")),
+    target_os = "netbsd",
     target_os = "openbsd",
 )))]
 mod imp {

std/src/sys/unix/thread.rs

@@ -202,7 +202,7 @@ impl Drop for Thread {
     not(target_os = "linux"),
     not(target_os = "freebsd"),
     not(target_os = "macos"),
-    not(all(target_os = "netbsd", not(target_vendor = "rumprun"))),
+    not(target_os = "netbsd"),
     not(target_os = "openbsd"),
     not(target_os = "solaris")
 ))]
@@ -222,7 +222,7 @@ pub mod guard {
     target_os = "linux",
     target_os = "freebsd",
     target_os = "macos",
-    all(target_os = "netbsd", not(target_vendor = "rumprun")),
+    target_os = "netbsd",
     target_os = "openbsd",
     target_os = "solaris"
 ))]

unwind/build.rs

@@ -22,8 +22,6 @@ fn main() {
         }
     } else if target.contains("freebsd") {
         println!("cargo:rustc-link-lib=gcc_s");
-    } else if target.contains("rumprun") {
-        println!("cargo:rustc-link-lib=unwind");
     } else if target.contains("netbsd") {
         println!("cargo:rustc-link-lib=gcc_s");
     } else if target.contains("openbsd") {