[ruby-cvs:78631] 943f3e5fd4 (master): add include guard

"Koichi Sasada" <[email protected]>
Newsgroups gmane.comp.lang.ruby.cvs
Message-ID <[email protected]>
Koichi Sasada	2019-12-09 16:20:35 +0900 (Mon, 09 Dec 2019)

  New Revision: 943f3e5fd4

  https://github.com/ruby/ruby/commit/943f3e5fd4

  Log:
    add include guard

  Modified files:
    builtin.h
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