Use cc crate instead of deprecated gcc crate

Author: bjorn3

unwind/Cargo.toml

@@ -10,7 +10,7 @@ fallible-iterator = "0.1"
 log = "0.4"
 
 [build-dependencies]
-gcc = "0.3.52"
+cc = "1.0.35"
 
 [dev-dependencies]
 backtrace = "0.3"

unwind/build.rs

@@ -1,10 +1,10 @@
-extern crate gcc;
+extern crate cc;
 use std::env;
 
 fn main() {
     match env::var("CARGO_FEATURE_ASM") {
         Err(env::VarError::NotPresent) => {
-            gcc::Build::new()
+            cc::Build::new()
                        .file("src/unwind_helper.c")
                        .compile("unwind_helper");
         },