Update GoogleTest.cmake

Author: mcbarton

cmake/modules/GoogleTest.cmake

@@ -37,7 +37,7 @@ else()
                 -DCMAKE_AR=${CMAKE_AR}
                 -DCMAKE_INSTALL_PREFIX=${CMAKE_INSTALL_PREFIX}
                 ${EXTRA_GTEST_OPTS})
-  set(BUILD_COMMAND ${CMAKE_COMMAND} --build ${CMAKE_BINARY_DIR}/unittests/googletest-prefix/src/googletest-build/ )
+  set(BUILD_COMMAND ${CMAKE_COMMAND} --build ${CMAKE_BINARY_DIR}/unittests/googletest-prefix/src/googletest-build/ --config $<CONFIG>)
 endif()
 
   ExternalProject_Add(