xbmc: add `gperf-native` to `DEPENDS`

xbmc: add `gperf-native` to `DEPENDS`

Task `configure` fails otherwise with the following error.

    configure: == VDADecoder support manually disabled. ==
    checking OpenMAX/il/OMX_Types.h usability... no
    checking OpenMAX/il/OMX_Types.h presence... no
    checking for OpenMAX/il/OMX_Types.h... no
    == Could not find libnvomx. OpenMax support disabled. ==
    checking for gawk... yes
    checking for cmake... yes
    checking for gperf... no
    configure: error: Could not find a required program. Please see the README f
    ERROR: Function do_configure failed

This patch is build tested with `angstrom-2008.1` for `MACHINE = "beagleboard"`.

Signed-off-by: Paul Menzel <paulepanter@users.sourceforge.net>
Signed-off-by: Tom Rini <tom_rini@mentor.com>