Set fbdev mode as the default mode on PPC (Olaf Hering).

Set fbdev mode as the default mode on PPC (Olaf Hering).
Added support for IBM space saver keyboard (Stefan Dirsch). Added support
    for Cherry CyMotion Master XPress (Marcus Schaefer).
Change order of SetDisplayDevice(), HWRestore(), UnbindGART() and
    RestoreBIOSMemSize() to be exactly opposite to the Save procedure in
    EnterVT() (Matthias Hopf, Alan Hourihane).
Fix text mode restauration by removing the assumption that the register
    which determines which head is programmed is set. to the active head by
    the BIOS (Mark Vojkovich).
When I wrote the resource code 5 years ago I made some assumptions which
    turned out to be false: I've assumed that the bus number of the PCI
    hostbridge would be the PCI bus the bridge links to. This is not
    correct. Fixing this assumption is not easy. However I hope that the
    attached patch will make the system work regardless as it 'ignores'
    host bridges from which the target bus is not known. This should not
    matter at all as we really don't care about host bridges (unless we
    have bridge specific code which retrieves information about the
    bridge).
Fixed server crash on reset when a structure allocated in PreInit() was
    freed on CloseScreen().
Fixed ring buffer lock ups that happened because the structure that
    contained ringbuffer data was not zeroed after allocation.
Fixed numerous warnings due to signed unsigned comparisons.
    programs/Xserver/hw/xfree86/drivers/nv/nv_driver.c:
    (NVBacklightEnable): Changed the order in which the sequencer registers
    and the backlight control registers are written. The sequencer control
    register need to be written first otherwise DPMS screen blanking
    produces vertical bars on a mobile device. lib/Xau/Imakefile: Build
    libXau static library PIC so it can be linked into toolkits that would
    like to wrap its functionality.