bluez5_utils: fix O_CLOEXEC build failure

Add a patch for bluez5_utils to fix the O_CLOEXEC build failure, due
to a missing <config.h> include.

Fixes:

  http://autobuild.buildroot.org/results/c61/c6117d261d0c7f938fabddb806d0b0095fe9dfb9/



Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>