message: Fix my recent fix and pass the parameter correctly
diff: @@ -85,7 +85,7 @@ externalproject_add(inttest_bin
  # CMAKE_CXX_COMPILER is passed for the case if the main cmake was called
  # with -DCMAKE_CXX_COMPILER but without -DCMAKE_TOOLCHAIN_FILE.
  "-DCMAKE_TOOLCHAIN_FILE:path=${CMAKE_TOOLCHAIN_FILE}"
  - "-DCMAKE_CXX_COMPILER=${CMAKE_CXX_COMPILER}"
  + "-DCMAKE_CXX_COMPILER:string=${CMAKE_CXX_COMPILER}"
  "-DGTEST_ROOT:path=${GTEST_ROOT}"
  "-DGMOCK_ROOT:path=${GMOCK_ROOT}"
  