bazaar: use standalone install

Closes Homebrew/homebrew#24787.

Formula/bazaar.rb

@@ -4,22 +4,20 @@ class Bazaar < Formula
   homepage 'http://bazaar-vcs.org/'
   url 'https://launchpad.net/bzr/2.6/2.6.0/+download/bzr-2.6.0.tar.gz'
   sha1 '5eb4d0367c6d83396250165da5bb2c8a9f378293'
-
-  depends_on :python
-
   def install
+    ENV.j1 # Builds aren't parallel-safe
+
     # Make and install man page first
     system "make man1/bzr.1"
     man1.install "man1/bzr.1"
 
-    python do
-      # In this python block, the site-packages are already set up
-      system python, "setup.py", "install", "--prefix=#{prefix}"
-      (prefix/'man').rmtree
-    end
-  end
+    # Put system Python first in path
+    ENV.prepend_path "PATH", "/System/Library/Frameworks/Python.framework/Versions/Current/bin"
 
-  def caveats
-    python.standard_caveats if python
+    system "make"
+    inreplace "bzr", "#! /usr/bin/env python", "#!/usr/bin/python"
+    libexec.install 'bzr', 'bzrlib'
+
+    bin.install_symlink libexec+'bzr'
   end
 end