auto merge of #20606 : alexcrichton/rust/stabilize-libc, r=brson
This commit prepares the liblibc library to be moved to crates.io. Unlike the log, serialize, term, etc crates, the source for this crate will *not* be duplicated out-of-tree. Instead a new rust-lang/libc repository will be created with a submodule to this repository and it will use the source directly. In order to compile within the stable ecosystem of Rust, this crate cannot link to libcore, and it also needs some tweaks for the other attributes that it has. As a result this commit tweaks the source of the crate to link to libcore when built in tree but link to libstd when built via cargo. Note that the rust-lang/libc crate isn't quite prepared just yet, there's a Cargo bug or two that I'd like to iron out before publishing it. This is simply preparing the in-tree source.
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