merge revision(s) r39290:
* lib/mkmf.rb: remove extra topdir in VPATH, which was in win32/Makefile.sub for some reason and moved from there. [ruby-dev:46998] [Bug #7864]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_0_0@39420 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
merge revision(s) r39290:
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_0_0@39420 b2dd03c8-39d4-4d8f-98ff-823fe69b080e