auto merge of #9550 : alexcrichton/rust/remove-printf, r=thestinger

The 0.8 release was cut, down with printf!

diff --cc src/libextra/base64.rs
Simple merge

diff --cc src/libextra/getopts.rs
Simple merge

diff --cc src/librustc/metadata/encoder.rs
Simple merge

diff --cc src/librustc/middle/trans/base.rs
Simple merge

diff --cc src/libstd/str.rs
Simple merge

diff --cc src/libsyntax/ext/expand.rs
Simple merge