Grant Nichol 671a9b450b Fix make install while files are in use ...

When the dwl executable is in use, cp fails without the -f flag.

POSIX defines this flag with:
> If a file descriptor for a destination file cannot be obtained,
> as described in step 3.a.ii., attempt to unlink the destination
> file and proceed.

2022-06-12 15:58:38 -05:00

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