[Synfig-devl] Building error fix for OSX10.9 cases building failure on OSX 10.7

[Yu C. <jc...@gm...>]

  Build master branch on OSX10.7 ,I got error:

In file included from ../..src/synfigapp/instance.h:30,
from app.h:49,
from main.cpp:33:
../../src/synfigapp/action.h:344: error: using dclearation 'using
synfigapp::Action::Base::set_param' conflicts with a previous using
declaration


Commit ID 4fffbd9 "fix warning: synfigapp:Action::Group::set_param hides
overloaded virtual function"

Reverted the above commit, building works.


Cheers
Yu

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