configure.in: fix didn't enable_dtrace=yes on auto.
configure.in: see enable_dtrace for adding libelf on FreeBSD.
common.mk: VPATH is not needed.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@37717 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
configure.in: fix didn't enable_dtrace=yes on auto.
configure.in: see enable_dtrace for adding libelf on FreeBSD.
common.mk: VPATH is not needed.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@37717 b2dd03c8-39d4-4d8f-98ff-823fe69b080e