use cc 1.0 instead of gcc

Cargo.toml

@@ -12,7 +12,7 @@ ethcore-bigint = { path = "../bigint" }
 tiny-keccak = "1.3"
 
 [build-dependencies]
-gcc = "0.3"
+cc = "1.0"
 
 [dev-dependencies]
 tempdir = "0.3"

build.rs

@@ -16,11 +16,11 @@
 
  // build.rs
 
-// Bring in a dependency on an externally maintained `gcc` package which manages
+// Bring in a dependency on an externally maintained `cc` package which manages
 // invoking the C compiler.
-extern crate gcc;
+extern crate cc;
 
 fn main() {
-    gcc::Build::new().file("src/tinykeccak.c").compile("libtinykeccak.a");
+	cc::Build::new().file("src/tinykeccak.c").compile("libtinykeccak.a");
 }