Fix Android TinyDtls build issue in Debug mode
Fix Android TinyDtls build issue in Debug mode

For Android build currently debug.c is not included.
In this case NDEBUG flag must be defined.
Provided a correct fix

Change-Id: Icaa4364a3e87bc33e9e7165977838ba1ea328506
Signed-off-by: jnashok <32619ffa69e16d1824dee3fe1b220f9cc76468e4@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/1618
Tested-by: jenkins-iotivity <09cb29e8a2b473a2c978382eec13ee06fa017bda@opendaylight.org>
Reviewed-by: Abhishek Pandey <bfec4fff64ad39722dcae01b68da676b133ad714@samsung.com>
Reviewed-by: Erich Keane <ec9f61fe526c14bb62c55d7c978f025ee6b3583d@intel.com>

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