Add a snapshot of baselibc

baselibc compiles to about 5 KiB, vastly better than Newlib that comes
with Mentor Sourcery Lite.

The baselibc snapshot is from this commit of the upstream project[1]:

commit 68d728f9bc53a47d406e4ba1d9aafbe45b502962
Merge: 758ddda b1d973f
Author: Petteri Aimonen <jpa@github.mail.kapsi.fi>
Date:   Wed Feb 6 08:27:39 2013 -0800

    Merge pull request #1 from bjornfor/master

    Build with -ffunction-sections -fdata-sections so that we get even smaller elf/binary files

[1]: https://github.com/PetteriAimonen/Baselibc