extlibs: Use patch as fallback and trap errors

extlibs: Use patch as fallback and trap errors

This will be helpful for Tizen and others OS.

If lib is bundled as "imported git patch"
then application of "duplicated ocf.patch as git patch",
is not needed anymore, and relies on scons.

To Tizen maintainers:
From now on let's maintain only one version in tree,
ealier versions of git patches can be reverted,
For reference check:
https://wiki.iotivity.org/tizen#maintenance_tips

Bug: https://jira.iotivity.org/browse/IOT-1745
Change-Id: I0598ddd5c846a2286218879d57381ec2f20c17a4
Signed-off-by: Philippe Coval <philippe.coval@osg.samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/18661
Tested-by: jenkins-iotivity <jenkins@iotivity.org>
Reviewed-by: Ziran Sun <ziran.sun@samsung.com>