Previously if an included makefile was rebuilt as a prerequisite of
another included makefile which didn't need to be rebuilt, make would
not realize that it needed to re-exec itself.
Ensure that if any included makefile target is rebuilt we re-exec.
Also ensure that if an included makefile is not readable, and our rule
for rebuilding it doesn't actually change it, we will still fail.
* src/remake.c (update_goal_chain): If a goal's update was successful
then check its status, even if no actual commands were run because it
was already up to date.
(show_goal_error): Remove superfluous cast.
* src/main.c (main): If the makefile remake did nothing, check that we
were able to successfully include all the makefiles we care about; if
not fail. When generating error messages about included makefiles be
sure to show the filename/linenumber information.
* test/scripts/features/reinvoke: Add tests for this behavior.
* test/scripts/options/dash-k: Update error messages.
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