[ruby-cvs:65666] nobu:r58494 (trunk): fix ripper prereq

[nobu at ruby-lang.org]

nobu	2017-04-27 21:30:55 +0900 (Thu, 27 Apr 2017)

  New Revision: 58494

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=58494

  Log:
    fix ripper prereq
    
    * common.mk (ext/ripper/ripper.c): fix VPATH when out-of-place
      build, and id.h was created in the build directory too.  it has
      to include the build directory, i.e., the current directory
      before `cd`.

  Modified files:
    trunk/common.mk