cogl: remove references to pre-Mavericks.

Formula/cogl.rb

@@ -26,31 +26,10 @@ class Cogl < Formula
   depends_on "gtk-doc"
   depends_on "pango"
 
-  # Lion's grep fails, which later results in compilation failures:
-  # libtool: link: /usr/bin/grep -E -e [really long regexp] ".libs/libcogl.exp" > ".libs/libcogl.expT"
-  # grep: Regular expression too big
-  if MacOS.version == :lion
-    resource "grep" do
-      url "https://ftp.gnu.org/gnu/grep/grep-2.20.tar.xz"
-      mirror "https://ftpmirror.gnu.org/grep/grep-2.20.tar.xz"
-      sha256 "f0af452bc0d09464b6d089b6d56a0a3c16672e9ed9118fbe37b0b6aeaf069a65"
-    end
-  end
-
   def install
     # Don't dump files in $HOME.
     ENV["GI_SCANNER_DISABLE_CACHE"] = "yes"
 
-    if MacOS.version == :lion
-      resource("grep").stage do
-        system "./configure", "--disable-dependency-tracking",
-               "--disable-nls",
-               "--prefix=#{buildpath}/grep"
-        system "make", "install"
-        ENV["GREP"] = "#{buildpath}/grep/bin/grep"
-      end
-    end
-
     args = %W[
       --disable-dependency-tracking
       --disable-silent-rules