Autogen: Restore target-ordering dependencies in Makefiles with DEPFILE
In !4221 (merged) the _autogen_timestamp_deps
target was given target ordering dependencies through its custom command
rather than direct target dependencies as on the _autogen
target.
Then !6558 (merged) converted some
target-level dependencies into file-level dependencies on the custom
command. This only works with a monolithic build graph like Ninja.
Since !8570 (merged) we use the _autogen_timestamp_deps
target in Makefile generators too. This exposed the missing target
ordering dependency.
Fixes: #25766 (closed)
Backport: release
Manual-backport: release-3.28