revert

Author: SchrodingerZhu

libc/src/stdlib/CMakeLists.txt

@@ -631,7 +631,6 @@ add_entrypoint_object(
   HDRS
     exit.h
   DEPENDS
-    libc.src.__support.threads.thread
     ${exit_deps}
 )
 

libc/src/stdlib/exit.cpp

@@ -14,7 +14,7 @@
 namespace LIBC_NAMESPACE_DECL {
 
 extern "C" void __cxa_finalize(void *);
-extern "C" void __cxa_thread_finalize();
+extern "C" [[gnu::weak]] void __cxa_thread_finalize();
 
 // TODO: use recursive mutex to protect this routine.
 [[noreturn]] LLVM_LIBC_FUNCTION(void, exit, (int status)) {