Fix oversized lib size of rcs_client of resource-encapsulation.

Fix oversized lib size of rcs_client of resource-encapsulation.

Caused by a wrong compile flag.
-g is an option for debug mode, it should be excluded for release.

Change-Id: I62d0910b27ac243f4d9b7f560164f0553968120c
Signed-off-by: coderhyme <jhyo.kim@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/3617
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Uze Choi <uzchoi@samsung.com>
(cherry picked from commit 803d90cbc721dc2568b1c45be3eba932577776fa)
Reviewed-on: https://gerrit.iotivity.org/gerrit/3673