Mac: Moved all 10.12 related constants to the top of the source, vastly reducing the number of #ifdefs. Found potentially a couple of errors in the existing #ifdefs ... will test more thoroughly. Also that last fix for WKWebKit didn't seem to work, so just using WKWebKit on Mojave an higher now.

#!/bin/sh
PLATFORM=`uname -s`

if [ $PLATFORM = "Darwin" ]
then
    mkdir -p dwtest.app/Contents/MacOS
    mkdir -p dwtest.app/Contents/Resources

    cp -f $1/mac/Info.plist dwtest.app/Contents
    cp -f $1/mac/PkgInfo dwtest.app/Contents
    cp -f dwtest dwtest.app/Contents/MacOS
fi