Remove extracted regression-test when cleaning up l3build


git-svn-id: http://www.latex-project.org/svnroot/experimental/trunk@5016 de43f980-851b-0410-b2f7-c40aca1f87e0
Correct logic for setting CTAN dir


git-svn-id: http://www.latex-project.org/svnroot/experimental/trunk@5017 de43f980-851b-0410-b2f7-c40aca1f87e0
Update build script for l3kernel as l3build now detects this case correctly


git-svn-id: http://www.latex-project.org/svnroot/experimental/trunk@5018 de43f980-851b-0410-b2f7-c40aca1f87e0