Makefile: Fix double escaping when DEPFILE is used In commit cfd8a5ac1f (Makefiles: Add support of DEPFILE for add_custom_command, 2020-12-04, v3.20.0-rc1~237^2~1) we added a `ConvertToOutputPath` call on a path given to the `depends` field of `WriteMakeRule`. The latter already handles escaping for Makefile syntax. Fixes: #25554