Prevent the following compile-time error due to a missing system

header file (see --enable-config-udev which defaults to "auto"):

  CCLD     Xorg
/usr/bin/ld: common/.libs/libcommon.a(udev.o): in function `device_added':
udev.c:(.text+0x2bb): undefined reference to `major'
/usr/bin/ld: udev.c:(.text+0x2fe): undefined reference to `minor'
/usr/bin/ld: udev.c:(.text+0x666): undefined reference to `minor'
/usr/bin/ld: udev.c:(.text+0x672): undefined reference to `major'
/usr/bin/ld: udev.c:(.text+0x69e): undefined reference to `minor'
/usr/bin/ld: udev.c:(.text+0x6ab): undefined reference to `major'
/usr/bin/ld: common/.libs/libcommon.a(udev.o): in function `device_removed':
udev.c:(.text+0xb6a): undefined reference to `minor'
/usr/bin/ld: udev.c:(.text+0xb77): undefined reference to `major'
/usr/bin/ld: common/.libs/libcommon.a(udev.o): in function `config_udev_odev_probe':
udev.c:(.text+0x10ee): undefined reference to `minor'
/usr/bin/ld: udev.c:(.text+0x10fc): undefined reference to `major'

Fixes: xorg/xserver#879

Signed-off-by: Guido Trentalancia <guido@trentalancia.com>
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