* thread.h: Change class names, methods, members and local vars

according to the GNU coding style.
* thread.cc: Ditto.
* dcrt0.cc (dll_crt0_1): Rename pthread::initMainThread call to
pthread::init_mainthread.
* pthread.cc (pthead_getsequence_np): Rename pthread::isGoodObject
call to pthread::is_good_object.

winsup/cygwin/pthread.cc

@@ -73,7 +73,7 @@ pthread_continue (pthread_t thread)
 unsigned long
 pthread_getsequence_np (pthread_t * thread)
 {
-  if (!pthread::isGoodObject (thread))
+  if (!pthread::is_good_object (thread))
     return EINVAL;
   return (*thread)->getsequence_np ();
 }