[WINETESTS] Remove forced _WIN32_WINNT defines (#2463)
Only comctl32 is affected. Import https://source.winehq.org/git/wine.git/commit/be3cda6ec0856d143d4737ee9306844569b76e15
authored by Serge Gautherie and committed by GitHub 6 years ago 803b5e13 8c986e17