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>

Correctly check for g++ existence.

Copyright 2007 Yann E. MORIN <yann.morin.1998@anciens.enib.fr>

Licensed to you as dmalloc-5.5.2 is.

diff -dur dmalloc-5.5.2.orig/configure dmalloc-5.5.2/configure

--- dmalloc-5.5.2.orig/configure	2007-05-18 11:40:31.000000000 +0200

+++ dmalloc-5.5.2/configure	2007-05-18 11:42:02.000000000 +0200

@@ -2643,7 +2643,7 @@

 # see if we actually have a CXX program

-if test "$ac_cv_prog_CXX" = "" -o ! -x "$ac_cv_prog_CXX"; then

+if test "$ac_cv_prog_CXX" = "" -o ! -x `which "$ac_cv_prog_CXX"`; then

     { echo "$as_me:$LINENO: WARNING: could not find C++ compiler $ac_cv_prog_CXX" >&5

 echo "$as_me: WARNING: could not find C++ compiler $ac_cv_prog_CXX" >&2;}

     enable_cxx=no