fixed _kfind_thread_ behavior

bepascal/source/bepascal/pas/src/be/kernel/os.pp

@@ -695,7 +695,7 @@ end;
 //---
 
 {$ifndef _KERNEL_MODE}
-function _kfind_thread_(const name : PChar) : thread_id; cdecl; external;
+function _kfind_thread_(const name : PChar) : thread_id; cdecl; external 'root' name '_kfind_thread_';
 {$inline ON} {$asmmode intel}
 function find_thread(const name : PChar) : thread_id; inline;
 begin