The double slashes "//" result from url./$TRASH/. expansion and the
current directory, which even in cygwin contains "/" as first
character. In cygwin such strings have special meaning: UNC path.
Accessing an UNC path built for test purpose usually fails.
Signed-off-by: Alex Riesen <raa.lkml@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>