merge revision(s) 40728:

	* ext/dl/lib/dl/func.rb (DL::Function#call): check tainted when
	  $SAFE > 0.

	* ext/fiddle/function.c (function_call): check tainted when $SAFE > 0.

	* test/fiddle/test_func.rb (module Fiddle): add test for above.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_0_0@40729 b2dd03c8-39d4-4d8f-98ff-823fe69b080e