[IOT-1779] Windows: fix linker errors for SECURED=0
[IOT-1779] Windows: fix linker errors for SECURED=0

The recently-added octbstack.dll exports from octbstack_product_with_tcp
were actually not available when SECURED=0.

Also, move the larger SConscript if/else paths to the 'else' branch,
for easier reading of these two nested if/else statements.

Change-Id: I66821e51c2beef2f2fbad2755a5f361ba836d892
Signed-off-by: Dan Mihai <ba8e1833495515b49ded9e20cae80a8129155aa9@microsoft.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/16807
Tested-by: jenkins-iotivity <d95b56ce41a2e1ac4cecdd398defd7414407cc08@iotivity.org>
Reviewed-by: Dave Thaler <8a98d0850f57b73c42d096f8f8b11e2d5522d554@microsoft.com>
Reviewed-by: Phil Coval <ff46fec9739d31cce915aabcc3a7a2c00eee4d6c@osg.samsung.com>

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