meta-oic: Hotfix to use tools from sysroot before system PATH

meta-oic: Hotfix to use tools from sysroot before system PATH

Prevent pkg-config not found issue

This patch was in iotivity 1.1-rel branch,
 and (wrongly) removed in 1.2.0

So it needed to be reintroduced in upstream 1.2-rel
 and as a patch for 1.2.0, track upstream bug at:
 https://jira.iotivity.org/browse/IOT-1219

Bug-AGL: SPEC-158

Thanks-to: Alison Chaiken
Change-Id: I6af59a590f8be489398623d29cf85c2f00000002
Signed-off-by: Philippe Coval <philippe.coval@osg.samsung.com>
(cherry picked from commit 7dd5a4100ffb71337c59046120c3c41547cb7f2b)