Allow Zig to be built with clang 11 and -Werror

This was brought to the horizon when using zig-bootstrap to cross compile
Zig for windows-gnu.
b498d26376Timon Kruiper committed on 11/19/2020, 12:32:48 AM· committed by Andrew Kelleyparentd3f1a4e
2 files changedLine totals unavailable