fix thread locals

Author: max-niederman

library/std/src/sys/pal/vexos/mod.rs

@@ -55,6 +55,11 @@ pub unsafe extern "C" fn _start() -> ! {
 
     main();
 
+    unsafe {
+        crate::sys::thread_local::destructors::run();
+    }
+    crate::rt::thread_cleanup();
+
     abort_internal()
 }
 

library/std/src/sys/thread_local/mod.rs

@@ -90,6 +90,7 @@ pub(crate) mod guard {
             target_family = "wasm",
             target_os = "uefi",
             target_os = "zkvm",
+            target_os = "vexos",
         ))] {
             pub(crate) fn enable() {
                 // FIXME: Right now there is no concept of "thread exit" on