* common.mk: version.o depends on $(srcdir)/include/ruby/version.h
  instead of {$(VPATH)}version.h to avoid confusion by VPATH between
  top level version.h and include/ruby/version.h for build in-place.
  [ruby-dev:47249] [Bug #8256]



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@40261 b2dd03c8-39d4-4d8f-98ff-823fe69b080e