### Please describe the problem.
git annex works perfectly fine under windows now; awesome work! One of the tests in the suite still fails (which might affect some features, that I don't use (yet?)).

### What steps will reproduce the problem?
[[!format sh """
$ git annex test -p addurl
"""]]

### What version of git-annex are you using? On what operating system?

[[!format sh """
$ git --version
git version 2.6.4.windows.1

$ git annex version
git-annex version: 5.20151218-g5008846
build flags: Assistant Webapp Webapp-secure Pairing Testsuite S3(multipartupload) WebDAV ConcurrentOutput DNS Feeds Quvi TDFA TorrentParser Database
key/value backends: SHA256E SHA256 SHA512E SHA512 SHA224E SHA224 SHA384E SHA384 SHA3_256E SHA3_256 SHA3_512E SHA3_512 SHA3_224E SHA3_224 SHA3_384E SHA3_384 SKEIN256E SKEIN256 SKEIN512E SKEIN512 SHA1E SHA1 MD5E MD5 WORM URL
remote types: git gcrypt S3 bup directory rsync web bittorrent webdav tahoe glacier ddar hook external
"""]]

Windows 10 (OS Build 10586.0)

### Please provide any additional information below.

[[!format sh """
$ git annex test -p addurl
Tests
  Unit Tests
Init Tests
    addurl:   init:   Detected a filesystem without fifo support.
  Disabling ssh connection caching.
  Detected a crippled filesystem.
  Enabling direct mode.
OK (2.74s)
  add:  fatal: This operation must be run in a work tree
OK (6.00s)

All 2 tests passed (8.79s)
  Detected a filesystem without fifo support.
  Disabling ssh connection caching.
  Detected a crippled filesystem.
  Enabling direct mode.
removeDirectoryRecursive: permission denied (The process cannot access the file because it is being used by another process.)
sleeping 10 seconds and will retry directory cleanup
FAIL (7.16s)
      addurl failed on file:///Users/born/.t/tmprepo0/myurl

1 out of 1 tests failed (28.13s)
  (This could be due to a bug in git-annex, or an incompatibility
   with utilities, such as git, installed on this system.)
"""]]


