runtime/cgo: use normal libinit on PPC GNU/Linux

The special case was because PPC did not support external linking, but
now it does.

Fixes #10410.

Change-Id: I9b024686e0f03da7a44c1c59b41c529802f16ab0
Reviewed-on: https://go-review.googlesource.com/22372
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: David Crawshaw <crawshaw@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

src/runtime/cgo/gcc_libinit.c

@@ -4,7 +4,6 @@
 
 // +build cgo
 // +build darwin dragonfly freebsd linux netbsd solaris
-// +build !ppc64,!ppc64le
 
 #include <pthread.h>
 #include <stdio.h>

src/runtime/cgo/gcc_libinit_linux_ppc64x.c

-// Copyright 2015 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// TODO: see issue #10410
-// +build linux
-// +build ppc64 ppc64le
-
-#include <stdio.h>
-#include <stdlib.h>
-
-void
-x_cgo_sys_thread_create(void* (*func)(void*), void* arg) {
-	fprintf(stderr, "x_cgo_sys_thread_create not implemented");
-	abort();
-}
-
-void
-_cgo_wait_runtime_init_done() {
-	// TODO(spetrovic): implement this method.
-}
-
-void
-x_cgo_notify_runtime_init_done(void* dummy) {
-	// TODO(spetrovic): implement this method.
-}
\ No newline at end of file