When updating from a higher wx release this change needs to be rechecked. The change was also included on the current 3.1.2 branch https://github.com/wxWidgets/wxWidgets/pull/1000 so this is essentially a backport (to 3.0.2 I believe pcsx2 uses ? ).
Delete files and directories that won't be used, and rename the wxWidgets 3.0 directory to reduce confusion when doing maintenance version upgrades.