merge revision(s) 39413: [Backport #7911]

	* dir.c (file_s_fnmatch, fnmatch_brace): encoding-incompatible pattern
	  and string do not match, instead of exception.  [ruby-dev:47069]
	  [Bug #7911]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_0_0@39662 b2dd03c8-39d4-4d8f-98ff-823fe69b080e