[ruby-cvs:72311] hsbt:r65211 (trunk): Mergr etc from github repository.

[hsbt at ruby-lang.org]

hsbt	2018-10-20 16:38:19 +0900 (Sat, 20 Oct 2018)

  New Revision: 65211

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=65211

  Log:
    Mergr etc from github repository.
    
      * ext/etc/extconf.rb: It supports to generate dependency header
        on standalone gem with github repository.

  Modified files:
    trunk/ext/etc/extconf.rb