cli: set sysroot when --sysroot option was passed

Fixes regression introduced in https://github.com/ziglang/zig/commit/0b47e69b7c0aedbc142400305cda86ef58b41656
ebf9ffd342Jakub Konka committed on 11/1/2022, 10:11:29 PMparent0d192ee
1 file changedLine totals unavailable