Clang: don't enable -Wzero-as-null-pointer-constant on 5.0.0

Authored by dfaure on Dec 20 2018, 7:02 PM.

Description

Clang: don't enable -Wzero-as-null-pointer-constant on 5.0.0

Summary:
The clang compiler in Android NDK r15b, which has version 5.0.300080,
warns as follows:

warning: unknown warning option '-Wzero-as-null-pointer-constant'; did you mean '-Wint-to-void-pointer-cast'? [-Wunknown-warning-option]

Test Plan: Removing the option removes the warning

Reviewers: aacid, cgiboudeaux, apol

Reviewed By: cgiboudeaux

Subscribers: kde-frameworks-devel, kde-buildsystem

Tags: Frameworks, Build System

Differential Revision: https://phabricator.kde.org/D17714