* src/native/jni.c (jni_attach_current_thread): New help function.

* src/native/jni.c (jni_attach_current_thread): New help function.
(_Jv_JNI_AttachCurrentThread): Use helper function.
(_Jv_JNI_AttachCurrentThreadAsDaemon): Likewise.
(_Jv_JNI_DetachCurrentThread): Implemented.

* src/threads/native/threads.c (method_thread_init)
(method_threadgroup_add_: Made static.
(threads_init): Code rearranged.
(threads_startup_thread): Removed thread detach code and call
threads_detach_thread.
(threads_detach_thread): New function.

* src/threads/native/threads.h (threads_detach_thread): Added.