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>

Give preference to target-optimised functions over glibc's ones,

which in turn ahave precedence over generic ones.

--- uClibc.orig/libc/Makefile	2005-07-20 08:10:44.000000000 +0200

+++ uclibc/libc/Makefile	2005-07-28 13:33:40.000000000 +0200

@@ -59,7 +59,7 @@

 	$(AR) dN 2 $(LIBNAME) $$objs && \

 	$(AR) dN 2 $(LIBNAME) $$objs

 	@for objfile in obj.signal \

-	                obj.string.generic obj.string.$(TARGET_ARCH) obj.string \

+	                obj.string obj.string.generic obj.string.$(TARGET_ARCH) \

 	                obj.sysdeps.common obj.sysdeps.$(TARGET_ARCH) ; do \

 		if [ -e $$objfile ] ; then \

 			echo $(AR) $(ARFLAGS) $(LIBNAME) $$objfile ; \