the dependency doesn't seem to make any sense.
while the deduplication is a bit naive and thus dangerous, it was
already enabled by default anyway by virtue of link_prl being enabled by
default, so this amounts to a non-change for by far most projects.
use no_lflags_merge to disable it.
Change-Id: Ia441931ddbc41ed617aee21e6fe8821e3448d2bc
Reviewed-by: Joerg Bornemann <joerg.bornemann@theqtcompany.com>