Update to the cc crate

This is the name the `gcc` crate has moved to

src/libstd/Cargo.toml

@@ -36,7 +36,7 @@ rustc_tsan = { path = "../librustc_tsan" }
 
 [build-dependencies]
 build_helper = { path = "../build_helper" }
-gcc = "0.3.50"
+cc = "1.0"
 
 [features]
 backtrace = []

src/libstd/build.rs

@@ -11,7 +11,7 @@
 #![deny(warnings)]
 
 extern crate build_helper;
-extern crate gcc;
+extern crate cc;
 
 use std::env;
 use std::process::Command;
@@ -77,7 +77,7 @@ fn main() {
 fn build_libbacktrace(host: &str, target: &str) -> Result<(), ()> {
     let native = native_lib_boilerplate("libbacktrace", "libbacktrace", "backtrace", ".libs")?;
 
-    let compiler = gcc::Build::new().get_compiler();
+    let compiler = cc::Build::new().get_compiler();
     // only msvc returns None for ar so unwrap is okay
     let ar = build_helper::cc2ar(compiler.path(), target).unwrap();
     let mut cflags = compiler.args().iter().map(|s| s.to_str().unwrap())