Change cp command to use -rfL option (backport #335) (#337)

Resolve symlinks from the `extra_packages` directory

(cherry picked from commit 2f73852)

Co-authored-by: Adrian <67166322+Caedael@users.noreply.github.com>
Co-authored-by: Aarav Gupta <aarav@spikonado.com>

Author: 3 people

libmicroros.mk

@@ -79,7 +79,7 @@ $(EXTENSIONS_DIR)/micro_ros_src/src:
     touch src/rcl_logging/rcl_logging_spdlog/COLCON_IGNORE; \
     touch src/rclc/rclc_examples/COLCON_IGNORE; \
 	touch src/rcl/rcl_yaml_param_parser/COLCON_IGNORE; \
-	cp -rf $(EXTRA_ROS_PACKAGES) src/extra_packages || :; \
+	cp -rfL $(EXTRA_ROS_PACKAGES) src/extra_packages || :; \
 	test -f src/extra_packages/extra_packages.repos && cd src/extra_packages && vcs import --input extra_packages.repos || :;