[ruby-cvs:73683] mame:r66579 (trunk): string.c: remove the deprecation warnings of `String#bytes` with block

[mame at ruby-lang.org]

mame	2018-12-26 23:43:25 +0900 (Wed, 26 Dec 2018)

  New Revision: 66579

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=66579

  Log:
    string.c: remove the deprecation warnings of `String#bytes` with block
    
    And its friends: lines, chars, grapheme_clusters, and codepoints.
    [Feature #6670] [ruby-core:90728]

  Modified files:
    trunk/string.c
    trunk/test/ruby/test_string.rb