cli: set sysroot when --sysroot option was passed
Fixes regression introduced in https://github.com/ziglang/zig/commit/0b47e69b7c0aedbc142400305cda86ef58b41656
54bdc0108aJakub Konka committed on 11/2/2022, 9:10:16 PM· committed by Andrew Kelleyparent57caec8