remove xmpp support

I've long considered the XMPP support in git-annex a wart.
It's nice to remove it.

(This also removes the NetMessager, which was only used for XMPP, and the
daemonstatus's desynced list (likewise).)

Existing XMPP remotes should be ignored by git-annex.

This commit was sponsored by Brock Spratlen on Patreon.

standalone/android/haskell-patches/gnuidn_fix-build-with-new-base.patch

@@ -1,50 +0,0 @@
-From afdec6c9e66211a0ac8419fffe191b059d1fd00c Mon Sep 17 00:00:00 2001
-From: foo <foo@bar>
-Date: Sun, 22 Sep 2013 17:24:33 +0000
-Subject: [PATCH] fix build with new base
-
----
- Data/Text/IDN/IDNA.chs       |    1 +
- Data/Text/IDN/Punycode.chs   |    1 +
- Data/Text/IDN/StringPrep.chs |    1 +
- 3 files changed, 3 insertions(+)
-
-diff --git a/Data/Text/IDN/IDNA.chs b/Data/Text/IDN/IDNA.chs
-index ed29ee4..dbb4ba5 100644
---- a/Data/Text/IDN/IDNA.chs
-+++ b/Data/Text/IDN/IDNA.chs
-@@ -31,6 +31,7 @@ import Foreign
- import Foreign.C
- 
- import Data.Text.IDN.Internal
-+import System.IO.Unsafe
- 
- #include <idna.h>
- #include <idn-free.h>
-diff --git a/Data/Text/IDN/Punycode.chs b/Data/Text/IDN/Punycode.chs
-index 24b5fa6..4e62555 100644
---- a/Data/Text/IDN/Punycode.chs
-+++ b/Data/Text/IDN/Punycode.chs
-@@ -32,6 +32,7 @@ import Data.List (unfoldr)
- import qualified Data.ByteString as B
- import qualified Data.Text as T
- 
-+import System.IO.Unsafe
- import Foreign
- import Foreign.C
- 
-diff --git a/Data/Text/IDN/StringPrep.chs b/Data/Text/IDN/StringPrep.chs
-index 752dc9e..5e9fd84 100644
---- a/Data/Text/IDN/StringPrep.chs
-+++ b/Data/Text/IDN/StringPrep.chs
-@@ -39,6 +39,7 @@ import qualified Data.ByteString as B
- import qualified Data.Text as T
- import qualified Data.Text.Encoding as TE
- 
-+import System.IO.Unsafe
- import Foreign
- import Foreign.C
- 
--- 
-1.7.10.4
-

standalone/android/haskell-patches/gnutls_0.1.4-0001-statically-link-with-gnutls.patch

@@ -1,43 +0,0 @@
-From 311aab1ae9d7a653edfbec1351f548b98de85c4b Mon Sep 17 00:00:00 2001
-From: androidbuilder <androidbuilder@example.com>
-Date: Mon, 26 May 2014 21:54:18 +0000
-Subject: [PATCH] hack gnutls to link on android
-
-This uses a hardcoded path to the library, which includes the
-arm-linux-androideabi-4.8 part. Will need to be changed when that changes..
-
-Have to list all the libraries that gnutls depends on, pkgconfig depends
-seems not to be working.
----
- gnutls.cabal |    9 +++++----
- 1 file changed, 5 insertions(+), 4 deletions(-)
-
-diff --git a/gnutls.cabal b/gnutls.cabal
-index 5bfe687..61db23f 100644
---- a/gnutls.cabal
-+++ b/gnutls.cabal
-@@ -31,16 +31,17 @@ source-repository this
- library
-   hs-source-dirs: lib
-   ghc-options: -Wall -O2
-+  LD-Options: -L /home/builder/.ghc/android-14/arm-linux-androideabi-4.8/sysroot/usr/lib/
-+
-+  extra-libraries: gnutls nettle hogweed gmp z
-+  pkgconfig-depends: gnutls
- 
-   build-depends:
-       base >= 4.0 && < 5.0
--    , bytestring >= 0.9
-+    , bytestring >= 0.10.3.0
-     , transformers >= 0.2
-     , monads-tf >= 0.1 && < 0.2
- 
--  extra-libraries: gnutls
--  pkgconfig-depends: gnutls
--
-   exposed-modules:
-     Network.Protocol.TLS.GNU
- 
--- 
-1.7.10.4
-