eliminate [-Wcomment] warning

eliminate [-Wcomment] warning

The JNI files mix C and C++ comments, so we get tons of annoying
warnings: "/*" within comment [-Wcomment]

Since the JNI layer is in C++ we remove the C comments.

Change-Id: I7fb5b2009a787e62de0b9b62ff7d06de4f33b699
Signed-off-by: Gregg Reynolds <reynolds-gregg@norc.org>
Reviewed-on: https://gerrit.iotivity.org/gerrit/9109
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Petre Eftime <petre.p.eftime@intel.com>
Reviewed-by: Habib Virji <habib.virji@samsung.com>
Reviewed-by: George Nash <george.nash@intel.com>
Reviewed-by: Phil Coval <philippe.coval@osg.samsung.com>
Reviewed-by: Ziran Sun <ziran.sun@samsung.com>