Since commit v3.0.0-rc1~448^2 (Ninja: use deps = gcc/msvc feature,
2013-10-18) the value of the `DEP_FILE` binding already includes the
needed quoting to refer to the file. However, that commit forgot to
update one of the `$DEP_FILE` references to not be quoted anymore.
The offending code path currently only affects cmcldeps for RC.
Remove the extra quoting now.