[ruby-cvs:65353] nagachika:r58182 (ruby_2_3): merge revision(s) 57762: [Backport #13267]

[nagachika at ruby-lang.org]

nagachika	2017-03-28 02:11:48 +0900 (Tue, 28 Mar 2017)

  New Revision: 58182

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=58182

  Log:
    merge revision(s) 57762: [Backport #13267]
    
    broken mingw
    
    * configure.in: check whether frexp and modf are broken.
    
    * include/ruby/win32.h (frexp, modf): ignore bad declarations when
      compiling as C++.  [ruby-core:79859] [Bug #13267]

  Modified directories:
    branches/ruby_2_3/
  Modified files:
    branches/ruby_2_3/configure.in
    branches/ruby_2_3/include/ruby/win32.h
    branches/ruby_2_3/version.h