Fix google test sconscript on newly cloned builds (as of April 15 2015).

Fix google test sconscript on newly cloned builds (as of April 15 2015).

This commit fixes IOT-487. This commit re-enables the google test
configure and make scripts on the Linux platform. This will allow the
unit tests to link with the resulting google test libraries.

Change-Id: I97ceb33c077bf21930bacb7685ff5598fa9cd123
Signed-off-by: Joseph Morrow <joseph.l.morrow@intel.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/786
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Doug Hudson <douglas.hudson@intel.com>
Reviewed-by: Erich Keane <erich.keane@intel.com>