xkeyboard-config: add git version(has htcdream keyboard support)

xkeyboard-config: add git version(has htcdream keyboard support)

This version add the (upstream) support for htc dream.

The support for the htcdream is composed the 'us','it','de'
  keyboards and has the extra-keys like | - _ etc... mapped.
  But no custom keys(keys that weren't printed on the keyboard
  were mapped yet, and some bugs are present for the htc dream)

The DEFAULT_PREFERENCE = "-1" is because of that(from #oe on FreeNode on irc):
  Jan 09 21:04:39 <Jay7>    or commit with DP=-1 then post request to ML about promoting to default
  Jan 09 21:04:48 <GNUtoo|laptop>   ok I'll send to ml
  Jan 09 21:05:14 <GNUtoo|laptop>   I push some other stuff that only touch htcdream, and get thoses on ml
  Jan 09 21:05:15 <hrw>     push with dp-1 first
  Jan 09 21:05:18 <GNUtoo|laptop>   ok
  Jan 09 21:07:11 <GNUtoo|laptop>   maybe I put DP -1 for all but not for SHR

In other words xkeyboard-config is used by a lot of distros/machines
  (all the machines which have a keyboard), and as it's a git version,
  so it's safer not to affect everyone in the case of a bug.

Signed-off-by: Denis 'GNUtoo' Carikli <GNUtoo@no-log.org>