Bug#766239: qtbase-opensource-src: Needs xkb-config-root setted

[Lisandro Damián Nicanor Pérez Meyer <lisandro@debian.org>]

Source: qtbase-opensource-src
Version: 5.3.2+dfsg-3~bpo70+1
Severity: important

While building qtbase we need to specify -xkb-config-root to set a path to 
XKB configuration data. This is required for keyboard input support.

That or backporting libxkbcommon (which is preferable).

-- System Information:
Debian Release: jessie/sid
  APT prefers testing
  APT policy: (990, 'testing'), (500, 'unstable')
Architecture: amd64 (x86_64)

Kernel: Linux 3.16-2-amd64 (SMP w/2 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash