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>

 # Compute MIPS-specific values

 CT_DoArchTupleValues() {

     # The architecture part of the tuple, override only for 64-bit

     if [ "${CT_ARCH_64}" = "y" ]; then

         CT_TARGET_ARCH="mips64${target_endian_el}"

     else

         # The architecture part of the tuple:

         CT_TARGET_ARCH="${CT_ARCH}${target_endian_el}"

     fi

     # Override CFLAGS for endianness:

     case "${CT_ARCH_ENDIAN}" in

         big)    CT_ARCH_ENDIAN_CFLAG="-EB";;

         little) CT_ARCH_ENDIAN_CFLAG="-EL";;

     esac

     # Override ABI flags

     CT_ARCH_ABI_CFLAG="-mabi=${CT_ARCH_mips_ABI}"

     CT_ARCH_WITH_ABI="--with-abi=${CT_ARCH_mips_ABI}"

 }