### Please describe the problem.

git-annex standalone has no SKEIN backends on i386 and amd64. OSX and Android standalones have them, debian package had it in version 4.20131106 and probably still does.

### What steps will reproduce the problem?

1. download git-annex standalone for amd64 or i386
2. extract
3. git-annex.linux/git-annex version

Expect key/value backends row to mention SKEIN. It does on other platforms, but not here.

Trying to e.g. get SKEIN-hashed files produces error messages.

### What version of git-annex are you using? On what operating system?
amd64 and i386 standalones 5.20140103 on Ubuntu Precise/12.04 (Mint 13)

### Please provide any additional information below.

[[!format sh """
clacke@acozed:~$ /usr/bin/git-annex version
git-annex version: 4.20131106
build flags: Assistant Webapp Pairing Testsuite S3 WebDAV Inotify DBus XMPP Feeds Quvi TDFA CryptoHash
key/value backends: SHA256E SHA1E SHA512E SHA224E SHA384E SKEIN256E SKEIN512E SHA256 SHA1 SHA512 SHA224 SHA384 SKEIN256 SKEIN512 WORM URL
remote types: git gcrypt S3 bup directory rsync web webdav glacier hook
clacke@acozed:~$ ~/.local/libexec/git-annex.linux-5.20140103/git-annex version
git-annex version: 5.20131230-g4aa88d8
build flags: Assistant Webapp Pairing S3 WebDAV Inotify DBus XMPP Feeds Quvi TDFA
key/value backends: SHA256E SHA1E SHA512E SHA224E SHA384E SHA256 SHA1 SHA512 SHA224 SHA384 WORM URL
remote types: git gcrypt S3 bup directory rsync web webdav glacier hook external
clacke@acozed:~$ ~/.local/libexec/git-annex.linux-5.20140103_i386/git-annex version
git-annex version: 5.20131230-g52a46585
build flags: Assistant Webapp Pairing S3 WebDAV Inotify DBus XMPP Feeds Quvi TDFA
key/value backends: SHA256E SHA1E SHA512E SHA224E SHA384E SHA256 SHA1 SHA512 SHA224 SHA384 WORM URL
remote types: git gcrypt S3 bup directory rsync web webdav glacier hook external
"""]]

-- [[clacke]]