Fix object directory for c_common/windows
Fix object directory for c_common/windows

Prior to this change, resource/c_common/windows/*.obj files were not
being created in VariantDir.

Change-Id: Ib0b59bc9adf575f3e76e0f6c7802ca0ca2ca9c3e
Signed-off-by: David Antler <847c7e7639e695cd03ee85957de4a1178f752d1b@intel.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/9445
Tested-by: jenkins-iotivity <09cb29e8a2b473a2c978382eec13ee06fa017bda@opendaylight.org>
Reviewed-by: Anisha Aggarwal <7211b1ce2df4177d8862d816db05df872186169a@intel.com>
Reviewed-by: Jon A. Cruz <44f878afe53efc66b76772bd845eb65944ed8232@joncruz.org>

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