From: Matthew Wilcox <matthew@wil.cx>
I inadvertently built a tree as root and then rebuilt it as a user.  I
got a lot of prompts ...
mv: overwrite `drivers/char/drm/drm_auth.o', overriding mode 0644?
Using mv -f fixes that.
Signed-off-by: Matthew Wilcox <matthew@wil.cx>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
                        -T $(@D)/.tmp_$(@F:.o=.ver);                    \
                rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver);        \
        else                                                            \
-               mv $(@D)/.tmp_$(@F) $@;                                 \
+               mv -f $(@D)/.tmp_$(@F) $@;                              \
        fi;
 endif