std.debug.SelfInfo.Elf: disable unwinding on mips n32 and x86 x32

The DWARF code can't handle these yet.

ref https://github.com/ziglang/zig/issues/25447
30f5258fe6Alex Rønne Petersen committed on 10/5/2025, 5:18:50 AMparent906ce2a
1 file changedLine totals unavailable