Snapshots don't work on RedHat 5.5

[eminence]

This is a very similar issue to rust-lang/rust/issues/9545 so I am hoping the same fix will not be hard to apply to cargo.

Trying to build cargo:

> make
"/u/users/lxd/bin/rustc" -v
rustc 0.12.0-pre (8067f4425 2014-09-17 21:15:38 +0000)
target/snapshot/bin/cargo build --target x86_64-unknown-linux-gnu  
target/snapshot/bin/cargo: /lib64/libc.so.6: version `GLIBC_2.8' not found (required by target/snapshot/bin/cargo)
target/snapshot/bin/cargo: /lib64/libc.so.6: version `GLIBC_2.7' not found (required by target/snapshot/bin/cargo)
make: *** [cargo-x86_64-unknown-linux-gnu] Error 1

[eminence]

you are the best