Revert^3 "Add platform/prebuilts/gcc/linux-x86/host/x86_64-w64-mingw32-4.8 to master-art."

This reverts commit babdf7a72efc49c88564c2b2f7a680f9e4798391.

Reason for revert: This workaround is no longer needed.

Change-Id: I2491daf2de32d1ab27199d74b717da24f21ea231
1 file changed