### Please describe the problem.

`git-annex log` fails to run if git is an older version.

### What steps will reproduce the problem?

`git-annex log` :)

i somewhat thought that this would work even if i had an older version of git because the standalone release would use the bundled git release...

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

5.20150610+gitg608172f-1~ndall+1 on Debian Wheezy.

### Please provide any additional information below.

[[!format sh """
# If you can, paste a complete transcript of the problem occurring here.
# If the problem is with the git-annex assistant, paste in .git/annex/daemon.log
$ git annex log video/mp4_sd/TV23_-_TV_Show_Excerpts_-Research.mov.mp4
fatal: unrecognized argument: -raw

$ git annex --debug log video/mp4_sd/TV23_-_TV_Show_Excerpts_-Research.mov.mp4
[2015-06-22 17:34:17 EDT] read: git ["--git-dir=.git","--work-tree=.","--literal-pathspecs","show-ref","git-annex"]
[2015-06-22 17:34:17 EDT] read: git ["--git-dir=.git","--work-tree=.","--literal-pathspecs","show-ref","--hash","refs/heads/git-annex"]
[2015-06-22 17:34:17 EDT] read: git ["--git-dir=.git","--work-tree=.","--literal-pathspecs","log","refs/heads/git-annex..8bf42e9c6e5b301f487a2d2d596d7cef12a3283d","-n1","--pretty=%H"]
[2015-06-22 17:34:17 EDT] read: git ["--git-dir=.git","--work-tree=.","--literal-pathspecs","log","refs/heads/git-annex..9a7b6b197d5271c29034d47e908fec7de6ea7e5a","-n1","--pretty=%H"]
[2015-06-22 17:34:17 EDT] chat: git ["--git-dir=.git","--work-tree=.","--literal-pathspecs","cat-file","--batch"]
[2015-06-22 17:34:17 EDT] read: git ["--git-dir=.git","--work-tree=.","--literal-pathspecs","ls-files","--cached","-z","--","video/mp4_sd/TV23_-_TV_Show_Excerpts_-Research.mov.mp4"]
[2015-06-22 17:34:17 EDT] read: git ["--git-dir=.git","--work-tree=.","--literal-pathspecs","log","-z","--pretty=format:%ct","-raw","--abbrev=40","--remove-empty","refs/heads/git-annex","--","d65/b94/SHA256E-s493891859--5413dd9efe00cbc091e78a7ce6a7034be0e6e121b7faaa054ad2836f8a80aaad.mov.mp4.log"]
fatal: unrecognized argument: -raw
$ git --version
git version 1.7.10.4
$ git annex version
git-annex version: 5.20150610+gitg608172f-1~ndall+1
build flags: Assistant Webapp Webapp-secure Pairing Testsuite S3 WebDAV Inotify DBus DesktopNotify XMPP DNS Feeds Quvi TDFA
key/value backends: SHA256E SHA1E SHA512E SHA224E SHA384E SKEIN256E SKEIN512E MD5E SHA256 SHA1 SHA512 SHA224 SHA384 SKEIN256 SKEIN512 MD5 WORM URL
remote types: git gcrypt S3 bup directory rsync web bittorrent webdav tahoe glacier ddar hook external
local repository version: 5
supported repository version: 5
upgrade supported from repository versions: 0 1 2 4
# End of transcript or log.
"""]]

--[[anarcat]]