bug#77897: "make clean" should do a "rm -rf .deps"

On Fri, Apr 18, 2025 at 07:56:49AM -0400, Sam Varshavchik wrote:
> .deps/filename gets created during building with --enable-dependency-tracking
> and should get removed by make clean. But it does not. For example:

Use 'make distclean' to remove depfiles.

Cheers,
  Nick