Don't install test resources

Rather copy them to the binary dir. This avoids installing the
resources, which is affected by the DESTDIR variable.

The custom command executes at build time rather than install time,
which means that installation is no longer required to run the tests.

Signed-off-by: Scott K Logan <logans@cottsay.net>

rcl/test/CMakeLists.txt

@@ -349,5 +349,6 @@ rcl_add_custom_gtest(test_security
 )
 
 # Install test resources
-install(DIRECTORY ${test_resources_dir_name}
-        DESTINATION ${CMAKE_CURRENT_BINARY_DIR})
+add_custom_target(${test_resources_dir_name} ALL
+  COMMAND ${CMAKE_COMMAND} -E copy_directory ${CMAKE_CURRENT_SOURCE_DIR}/${test_resources_dir_name} ${test_resources_dir_name}
+  COMMENT "Copying test resources")