No more explicit cl tools -- brew handles that. tap homebrew dupes

before doing cider restore.

tasks/osx.py

@@ -7,7 +7,6 @@ from . import util
 
 @ctask(default=True)
 def setup(ctx):
-    cl_tools(ctx)
     brew(ctx)
     cider(ctx)
     access_for_assistive_devices(ctx)
@@ -44,6 +43,7 @@ def osx_config(ctx):
 
 @ctask
 def cider(ctx):
+    ctx.run('brew tap homebrew/dupes')
     ctx.run('brew install caskroom/cask/brew-cask')
     if not util.command_exists('cider'):
         ctx.run('sudo pip install cider')