[ruby-cvs:69674] nobu:r62493 (trunk): mjit.c: fix compile error

[nobu at ruby-lang.org]

nobu	2018-02-20 16:51:22 +0900 (Tue, 20 Feb 2018)

  New Revision: 62493

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=62493

  Log:
    mjit.c: fix compile error
    
    * mjit.c (check_tmpdir): W_OK and S_ISDIR may not defined on
      Windows.

  Modified files:
    trunk/mjit.c