Revert "Merge pull request #2991 from emekoi/mingw-ci"

This reverts commit ec7d7a5b14540ea3b2bab9f11318630338467965, reversing
changes made to 81c441f8855d4c58f0b2ff86d3d007cf0bf395d3.

It looks like this broke colors in Windows Command Prompt (#3147)
and this method of detecting native C ABI isn't working well (#3121).
8b1900e5dfAndrew Kelley committed on 9/1/2019, 4:33:02 AMparentec6f15b
4 files changedLine totals unavailable