[OE-core] update_icon_cache host access

[Eric Bénard]

Hi,

while building an image I got :

Running intercept scripts:
> Executing update_font_cache
> Executing update_icon_cache
Failed to create file
'/usr/lib/i386-linux-gnu/gdk-2.0/2.10.0/loaders.cache.K0FPXW':
Permission denied

apt-get remove libgdk-pixbuf2.0-0
workaround the problem in the present case but it seems that if
gdk-pixbuf is present on the host, it will be used instead of the one
built by OE.

Build Configuration:
BB_VERSION        = "1.18.0"
BUILD_SYS         = "i686-linux"
NATIVELSBSTRING   = "Ubuntu-12.04"
TARGET_SYS        = "arm-oe-linux-gnueabi"
DISTRO            = "defaultsetup"
DISTRO_VERSION    = "oe-core.0"
TUNE_FEATURES     = "armv7a vfp neon"
TARGET_FPU        = "vfp-neon"

Eric