Add GCC flag "-Wno-narrowing" on 3rd party to correct x86_64 build issue...

Hi,

Please find below a proposal to avoid 64-bit compilation build issues with GCC >= 4.7

Regards,

....

Change-Id: I5b8a3019e7f72fcc1f70e8f7e54761b5969f5f29
Signed-off-by: Yannick GICQUEL <yannick.gicquel@open.eurogiciel.org>