Revert "Update mingw prebuilts to enable build with Clang"

This reverts commit 459be1880ba0b6217c123bd84c67e83a44ccfb0a.

Reason for revert: b/110979255, b/110978596

Change-Id: I8ed0cd4ea0d22a22ffac588ba27488a1faefe745
1828 files changed