Revert part of
    commit dd8d5e57
    Date:   Mon Apr 29 11:18:21 2019 +0200
    improve loplugin:stringconstant

sberg's original gerrit comment:
but there can also be other problematic overloads for parameters like
`void const *` or `std::string_view`.  I'm not sure this change is worth
the potential false positives.

and continuing IRC discussion:
<noelgrandin> I'll revert the compilerplugins/ part
<sberg> noelgrandin, my main concern is that /if/ somebody eventually
runs into such an overload situation, it's really hard to get the
warnings/errors fixed for those people, short of going into the plugin
itself

Change-Id: I4916ce8943c4319d7ef9084e22d6a0eeb430b15c