[ruby-cvs:70104] naruse:r63010 (ruby_2_5): Revert wrong commit r62976-r62978

[naruse at ruby-lang.org]

naruse	2018-03-28 22:45:50 +0900 (Wed, 28 Mar 2018)

  New Revision: 63010

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=63010

  Log:
    Revert wrong commit r62976-r62978

  Modified files:
    branches/ruby_2_5/ext/sdbm/_sdbm.c
    branches/ruby_2_5/ext/sdbm/init.c
    branches/ruby_2_5/ext/sdbm/sdbm.h