Match mspgcc-libc filename.

Was: mspgcc-libc-bin-20120406-1-x86_64.pkg.tar.xz
Now: mspgcc-libc-bin-20120224-1-x86_64.pkg.tar.xz
Merge pull request #1 from ryanmjacobs/fix-name

Match mspgcc-libc filename.