Updated Tizen GBS build script to fix tinycbor clone error

Updated Tizen GBS  build script to fix tinycbor clone error

During Jenkins build, tinycbor library is copied as a soft link in extlibs folder.
For Tizen build, we copy from this location to tmp folder, which in turn
is copied to GBS-ROOT during build. While copying from extlibs/tinycbor
which is present as a soft link, error appear during jenkins build.

Fixed the error by giving -L option during in copy command.
Also, added error return clause in gbs build script to enable
jenkins catch the error in case of build break.

Change-Id: I24c149dabd3ac3c382adf8aa11a60b0adae38a68
Signed-off-by: Abhishek Pandey <abhi.siso@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/3247
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Madan Lanka <lanka.madan@samsung.com>