Eliminate guard_condition or refactor out rmw references

[nightduck]

hazcat/hazcat/include/hazcat/guard_condition.h

Lines 51 to 55 in 21f2823

	rmw_ret_t
	copy_guard_condition(
	rmw_guard_condition_t * dest,
	guard_condition_t * dest_impl,
	rmw_guard_condition_t * src);

It contains references to rmw that must be refactored. However, it looks like this is vestigial code that can be removed all together. Look for anyone still using it.