make split_value_list() even less sane again

contrary to what one may expect, it's actually *not* supposed to remove
the meta-characters it interprets.

luckily, this function is not used much any more ...

Change-Id: I2b60f9b173140da78db2b07b596cc2e5f6e6d555
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>
(cherry picked from qtbase/783181cfc11e995ad678237ebc0025a2a023c88c)