optional/capi: use LIBRUBYARG_SHARED
optional/capi: use LIBRUBYARG_SHARED

* spec/rubyspec/optional/capi/spec_helper.rb (compile_extension):
  use LIBRUBYARG_SHARED for LDSHARED.

git-svn-id: ab86ecd26fe50a6a239cacb71380e346f71cee7d@58733 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ruby/spec,ruby/spec,nobu/rubyspec,nobu/rubyspec,eregon/rubyspec,sgarciac/spec,sgarciac/spec,ruby/spec,ruby/rubyspec,sgarciac/spec,ruby/rubyspec,eregon/rubyspec,nobu/rubyspec,eregon/rubyspec