Remove SVNMirror related code from build.webkit.org codebase. This is dead code after https://trac.webkit.org/changeset/156771/webkit, as also noted in https://bugs.webkit.org/show_bug.cgi?id=85887#c32
Created attachment 411567 [details] Patch
Committed r268594: <https://trac.webkit.org/changeset/268594> All reviewed patches have been landed. Closing bug and clearing flags on attachment 411567 [details].
<rdar://problem/70379902>