Remove --universal options from homebrew rules.

 - they are ignored at the moment and therefore have not been used in a long time
 - on recent OS X these options are certainly wrong, so this is a prerequisite for merging
   ros-infrastructure/rosdep#304

rosdep/osx-homebrew.yaml

@@ -57,7 +57,6 @@ collada-dom:
 cppunit:
  osx:
  homebrew:
- options: [--universal]
  packages: [cppunit]
 curl:
  osx:
@@ -123,7 +122,6 @@ graphviz:
 gtest:
  osx:
  homebrew:
- options: [--universal]
  packages: [gtest]
 gtk2:
  osx:
@@ -329,7 +327,6 @@ libxxf86vm:
 log4cxx:
  osx:
  homebrew:
- options: [--universal]
  packages: [log4cxx]
 lua-dev:
  osx:
@@ -593,7 +590,6 @@ unzip:
 uuid:
  osx:
  homebrew:
- options: [--universal]
  packages: [uuid]
 wxpython:
  osx:
@@ -606,7 +602,6 @@ wxwidgets:
 yaml:
  osx:
  homebrew:
- options: [--universal]
  packages: [libyaml]
 yaml-cpp:
  osx: