Add support for NetBSD thread events (create, exit)

Add support for NetBSD thread events (create, exit)

Report LWP CREATE and LWP EXIT events and setup this on post_attach()
and post_startup_inferior().

Stop reinitializing the list of recognized threads in update_thread_list().

Handle LWP CREATE and EXIT events in nbsd_nat_target::wait().

gdb/ChangeLog:

        * nbsd-nat.c (nbsd_enable_proc_events)
        (nbsd_nat_target::post_startup_inferior): Add.
        (nbsd_nat_target::post_attach): Call `nbsd_enable_proc_events'.
        (nbsd_nat_target::update_thread_list): Rewrite.
        (nbsd_nat_target::wait): Handle "PTRACE_LWP_EXIT" and
        "PTRACE_LWP_CREATE".
        * nbsd-nat.h (nbsd_nat_target::post_startup_inferior): Add.