Revert "Add C++11 libraries step for OSX"

This reverts commit 37a2c196cf.

master.cfg

@@ -274,9 +274,6 @@ def generic_builder(id, libdir='', branch='', rsync=False):
     f = BuildFactory()
     if libdir != '':
         f.addStep(lib_svn_step(libdir))
-        # Special trick to make sure we always have all the libs.
-        if libdir.startswith("darwin"):
-            f.addStep(lib_svn_step("darwin"))
 
     for submodule in ('blender-translations',
                       'blender-addons',