Auto submodule update: cmake - Add TEST_SRCS property and swift_add_t…

…est_srcs_target macro [BUILD-657] (#151) (#1319)

cmake - Add TEST_SRCS property and swift_add_test_srcs_target macro [BUILD-657]
* Add TEST_SRCS global property [BUILD-657]

* Add swift_add_test_srcs_target macro

Triggered-By:	cmake	b5f4e040b2c0449f7dbd8ecef02ad22a95f90c6e
Upstream-PR:	http://github.com/swift-nav/cmake/pull/151