Make glibc_download.sh say which version it got
Make glibc_download.sh say which version it got

It's hard to tell from a toolchain bot log which glibc build
it was that got sucked into a Mac or Windows toolchain build.
Just say it.

BUG=none
TEST=none

R=eaeltsin@google.com
TBR=

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@5891 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,nacl-webkit/native_client,nacl-webkit/native_client,sbc100/native_client,nacl-webkit/native_client,nacl-webkit/native_client,nacl-webkit/native_client