Useful patches from v3.0.4..WX_3_0_BRANCH available by end of day
2019-07-13.
Some bakefile, 3.0.5 version update, wxMSW and wxMac patches removed.

Also commit a309157a666e cherry-pick on top, as we want to remove
webview from wx-config --libs to avoid overlinking in 3.0.x too.
