Revert "std.zig.system: disable vector support on s390x for now"

This reverts commit 1cd913a0ec816f44d157980ade00a6560832a348.

The bug was fixed in LLVM 22.
bd0a5082a7Alex Rønne Petersen committed on 2/19/2026, 6:14:07 PMparent449d33b
1 file changedLine totals unavailable