Apply windows hack in {{{svn_fs}}} unit tests only when running on windows. Older repositories may not have a {{{db/format}}}} file, so check whether it exists before doing a {{{chmod}}}.
Apply windows hack in {{{svn_fs}}} unit tests only when running on windows. Older repositories may not have a {{{db/format}}}} file, so check whether it exists before doing a {{{chmod}}}.

git-svn-id: f68c6b3b1dcd5d00a2560c384475aaef3bc99487@1916 af82e41b-90c4-0310-8c96-b1721e28e2e2

exocad/exotrac,moreati/trac-gitsvn,exocad/exotrac,dokipen/trac,moreati/trac-gitsvn,exocad/exotrac,moreati/trac-gitsvn,moreati/trac-gitsvn,dafrito/trac-mirror,dafrito/trac-mirror,dafrito/trac-mirror,dokipen/trac,dafrito/trac-mirror,dokipen/trac,exocad/exotrac