Modify gbsbuild script file to support other options

Modify gbsbuild script file to support other options

- before this commit, gbsbuild script file can get a few build options like as "WITH_TCP, WITH_CLOUD, WITH_PROXY, etc.."
- so, to add other option, need to modify gbsbuild scriptfile.
- in this commit, I modified gbsbuild script file to support other options
- using bash script, gets other option like way to get option in other platform
- ex) ./gbsbuild.sh WITH_TCP=1 WITH_CLOUD=1 SECURED=1 WITH_MQ=PUB,SUB

Change-Id: I61c0b02fe68acf517b64de7e3a8a10fe2549c3d2
Signed-off-by: YounghyunJoo <yh_.joo@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/14637
Reviewed-by: JungYong KIM <jyong2.kim@samsung.com>
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: JunHo Lee <junho13.lee@samsung.com>
Reviewed-by: daeken kwon <daeken.kwon@samsung.com>
Reviewed-by: Phil Coval <philippe.coval@osg.samsung.com>