use appropriate compile flags for libimobiledevice
use appropriate compile flags for libimobiledevice

The makefile was hardcoding -limobiledevice instead of using
the flags provided by pkg-config. This was causing issues on
debian squeeze where this caused link failures.

neuschaefer/libgpod,neuschaefer/libgpod,neuschaefer/libgpod,neuschaefer/libgpod,hyperair/libgpod,hyperair/libgpod,neuschaefer/libgpod,hyperair/libgpod,hyperair/libgpod,hyperair/libgpod