[PATCH 26/30] nptl: Remove pthread raise implementation

[Florian Weimer]

* Adhemerval Zanella via Libc-alpha:

> The Linux version already target the current thread by using tgkill
> along with getpid and gettid.

This needs to update localplt.data on the targets that call raise from
libgcc (such as arm-linux-gnueabi).  The call still uses a PLT, but
that's expected because raise is not locally defined anymore.

Thanks,
Florian