[ros-diffs] [hyperion] 44594: modified Makefile New ${checkpoint} command to create an empty "checkpoint" file, to store the last modified date of a make target modified tools/rbuild/backend/mingw/rules.mak Rules that output more than one file at once don't mix well with parallel builds: serialize dependency checks through the use of checkpoint files. Fixes intermittent widl issues in highly parallel builds Bonus internal rbuild function that I had to commit one day or another See issue #4994 for more detai