Tests: Fix XCTest build configuration

Build the test binaries with the same configuration in which they will
be tested instead of the default Debug configuration.  This fixes the
test when run in a Release configuration.

Tests/CMakeLists.txt

@@ -1728,6 +1728,7 @@ ${CMake_BINARY_DIR}/bin/cmake -DDIR=dev -P ${CMake_SOURCE_DIR}/Utilities/Release
 
   if(CMake_TEST_XCODE_VERSION AND NOT CMake_TEST_XCODE_VERSION VERSION_LESS 5
      AND OSX_VERSION MATCHES "^([0-9]+\\.[0-9]+)")
+    set(XCTest_CTEST_OPTIONS --build-config $<CONFIGURATION>)
     set(XCTest_BUILD_OPTIONS -DCMAKE_OSX_DEPLOYMENT_TARGET=${CMAKE_MATCH_1} -DCMAKE_OSX_SYSROOT=macosx)
     ADD_TEST_MACRO(XCTest ${CMAKE_CTEST_COMMAND} -C $<CONFIGURATION> -V)
   endif()