Compile libmraa for Android and Brillo

Compile libmraa for Android and Brillo

Add makefile for building libmraa library.

Import glob functionality from the NetBSD project where the glob.c and
glob.h files are released under BSD 3-clause License. Minor changes were
applied in order to make them compile for Android and Brillo.

This patch adds a control pipe used to interrupt the poll() function
as an alternative to pthread cancellation API.

Change-Id: Id719da4c839acbd320b0cc0e0113c2a5239c8029
Signed-off-by: Mihai Serban <mihai.serban@intel.com>
Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>