Revert "package wxwidgets: enable mingw-w64 builds"

This reverts commit a5663fa1c7e1837af88c02c95c9f829d60042d9c.
Revert "package wxwidgets: refactor build rules"

This reverts commit 7608a3904e1174ccf508c6e1940183594201943a.
Revert "package wxwidgets: update and remove legacy 2.4/2.6 compatibility"

This reverts commit 70cbd092fd8cb135abb3153f16306569124d5a0c.