Using != doesn't work for bakefile, I don't know what does, or what this

change really wanted to achieve, but its been broken for a couple of days
now.  Back to you ABX for a real fix.  But please install bakefile if you
are going to tweak these files.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@29151 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775