This is in addition to the last change which started including them in
the make dependency list.
gcc/d/ChangeLog:
2020-03-22 Iain Buclaw <ibuclaw@gdcproject.org>
PR d/93038
* d-lang.cc (deps_write): Generate phony targets for content imported
files.
gcc/testsuite/ChangeLog:
2020-03-22 Iain Buclaw <ibuclaw@gdcproject.org>
PR d/93038
* gdc.dg/pr93038b.d: New test.
