cmake: Use pkg-config instead of manually added flags
cmake: Use pkg-config instead of manually added flags

Change-Id: Ic51f241713ae4e8dfcf9e60acbc31fd3c1fcd8a3
Signed-off-by: Krzysztof Opasiak <8064eda6f94b3817252b7d7649cf754592f63500@samsung.com>

gadgetd/gadgetd,gadgetd/gadgetd,gadgetd/gadgetd