libg/eglibc: add updated eglibc 2.15

Includes a patch to remove __builtin_expect test:

In eglibc-2.15, the build breaks in configure while testing
for the existance of __builtin_expect. It fails with newer
versions of gcc.

This patch is a modification of an upstream change in glibc
mainline (to be 2.16) to fix the following error:

[CFG ] checking for __builtin_expect... no
[ERROR] configure: error: support for __builtin_expect needed

http://sourceware.org/git/?p=glibc.git;a=commit;h=3857022a761ea7251f8e5c0e45d382ebc3e34cf9

Signed-off-by: Bryan Hundven <bryanhundven@gmail.com>
[yann.morin.1998@free.fr: coalesce both patches into a single changeset]
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>

2008-04-28  Hiroki Kaminaga  <kaminaga@sm.sony.co.jp>

	[BZ 6740]

	nptl/sysdeps/powerpc/tcb-offsets.sym (PRIVATE_FUTEX_OFFSET):

	Guard sym definition with #ifndef __ASSUME_PRIVATE_FUTEX.

--- a/nptl/sysdeps/powerpc/tcb-offsets.sym

+++ b/nptl/sysdeps/powerpc/tcb-offsets.sym

@@ -15,4 +15,6 @@

 PID				thread_offsetof (pid)

 TID				thread_offsetof (tid)

 POINTER_GUARD			(offsetof (tcbhead_t, pointer_guard) - TLS_TCB_OFFSET - sizeof (tcbhead_t))

+#ifndef __ASSUME_PRIVATE_FUTEX

 PRIVATE_FUTEX_OFFSET		thread_offsetof (header.private_futex)

+#endif