libc/glibc: add 2.13

Patchset provided by "Ioannis E. Venetis" <venetis@mail.capsl.udel.edu>
http://sourceware.org/ml/crossgcc/2011-04/msg00072.html
http://sourceware.org/ml/crossgcc/2011-04/msg00073.html

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>

 reporter_name="Yann E. MORIN"

 reporter_url="http://ymorin.is-a-geek.org/projects/crosstool"

 reporter_comment="EXPERIMENTAL MIPS-64 n32 toolchain."