Most importantly, this allows us to remove all MSLU-related stuff.
Some functions which were previously loaded dynamically can now be just used
directly, too.
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76535 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Build a GUI version of the benchmark program too and use it to benchmark
wxImage loading methods for now (more will be added later).
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74319 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
