Remove fails with clang due to go 1.2.

Closes Homebrew/homebrew#24853.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>

Formula/etcd.rb

@@ -8,10 +8,6 @@ class Etcd < Formula
 
   depends_on 'go' => :build
 
-  fails_with :clang do
-    cause "clang: error: no such file or directory: 'libgcc.a'"
-  end
-
   def install
     ENV['GOPATH'] = buildpath
     system "./build"

Formula/juju.rb

@@ -7,10 +7,6 @@ class Juju < Formula
 
   depends_on 'go' => :build
 
-  fails_with :clang do
-    cause "clang: error: no such file or directory: 'libgcc.a'"
-  end
-
   def install
     ENV['GOPATH'] = buildpath
     args = %w(install launchpad.net/juju-core/cmd/juju)