lrzsz: use brew mirror

We may boneyard this at some point if upstream doesn't sort out the SSL issue.

Closes Homebrew/legacy-homebrew#50104.
Closes Homebrew/legacy-homebrew#50010.
Closes Homebrew/legacy-homebrew#50096.

Formula/lrzsz.rb

@@ -1,7 +1,10 @@
 class Lrzsz < Formula
   desc "Tools for zmodem/xmodem/ymodem file transfer"
+  # Homepage and URL redirect http to https, which is great.
+  # Less great: Upstream SSL cert expired Dec 2015 and now fails to download.
   homepage "http://www.ohse.de/uwe/software/lrzsz.html"
-  url "http://www.ohse.de/uwe/releases/lrzsz-0.12.20.tar.gz"
+  # url "http://www.ohse.de/uwe/releases/lrzsz-0.12.20.tar.gz"
+  url "https://dl.bintray.com/homebrew/mirror/lrzsz-0.12.20.tar.gz"
   sha256 "c28b36b14bddb014d9e9c97c52459852f97bd405f89113f30bee45ed92728ff1"
 
   def install
@@ -13,7 +16,10 @@ def install
     bin.install "src/lrz", "src/lsz"
 
     system "make", "install"
-
     bin.install_symlink "lrz" => "rz", "lsz" => "sz"
   end
+
+  test do
+    assert_match version.to_s, shell_output("#{bin}/lrb --help 2>&1")
+  end
 end