fixed pthread build issue on linux platform
fixed pthread build issue on linux platform

resolved the build issue caused by merge of
https://gerrit.iotivity.org/gerrit/#/c/249/

Change-Id: I4936c07340658d455491f9e90d66b734e9a59e97
Signed-off-by: hyuna0213.jo <a3aecee2eabd6f87461b5d05d6fd0eaf35e269ed@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/9347
Tested-by: jenkins-iotivity <09cb29e8a2b473a2c978382eec13ee06fa017bda@opendaylight.org>
Reviewed-by: Jaehong Jo <69db334b3f87f30654728856fde276b43c835fe5@samsung.com>
Reviewed-by: Jon A. Cruz <44f878afe53efc66b76772bd845eb65944ed8232@joncruz.org>

rzr/iotivity,iotivity/iotivity,rzr/iotivity,iotivity/iotivity,rzr/iotivity,rzr/iotivity,rzr/iotivity,iotivity/iotivity,rzr/iotivity,iotivity/iotivity,iotivity/iotivity,iotivity/iotivity,iotivity/iotivity,iotivity/iotivity,rzr/iotivity