buildsys: remove existing symlinks before installing
This fixes build errors when performing a manual install straight to a
filesystem where the files already exist.
Reported-by: Sergej Pupykin <email@example.com>
Signed-off-by: Dave Reisner <firstname.lastname@example.org>
We probably could also just add in the -f flag to the ln/cp calls, but I feel
safer doing it this way. $(RM) will unconditionally expand to 'rm -f'.