rust 1.9.0

The patch was backported to the master branch in [1], therefore it's safe to
remove.

1.) rust-lang/rust@98f0a9128f0fc65

Closes #1460.

Signed-off-by: Dominyk Tiller <dominyktiller@gmail.com>

Formula/rust.rb

@@ -3,8 +3,8 @@ class Rust < Formula
   homepage "https://www.rust-lang.org/"
 
   stable do
-    url "https://static.rust-lang.org/dist/rustc-1.8.0-src.tar.gz"
-    sha256 "af4466147e8d4db4de2a46e07494d2dc2d96313c5b37da34237f511c905f7449"
+    url "https://static.rust-lang.org/dist/rustc-1.9.0-src.tar.gz"
+    sha256 "b19b21193d7d36039debeaaa1f61cbf98787e0ce94bd85c5cbe2a59462d7cfcd"
 
     resource "cargo" do
       # git required because of submodules
@@ -16,13 +16,6 @@ class Rust < Formula
       url "https://static-rust-lang-org.s3.amazonaws.com/cargo-dist/2015-09-17/cargo-nightly-x86_64-apple-darwin.tar.gz"
       sha256 "02ba744f8d29bad84c5e698c0f316f9e428962b974877f7f582cd198fdd807a8"
     end
-
-    # Build on Xcode 7.3
-    # https://github.com/rust-lang/rust/issues/32442
-    patch do
-      url "https://github.com/rust-lang/rust/commit/79da64a.diff"
-      sha256 "78ebf373cb19be5fef053776729109824cc7bbbd2bd375e9c444bef7ea41faf7"
-    end
   end
 
   head do