Doug Johnson 1692877d43 os: backtrace: Fix -Wincompatible-pointer-types compiler error on 32-bit targets ...

```
../os/backtrace.c: In function ‘print_registers’:
../os/backtrace.c:94:52: error: passing argument 3 of ‘_ULarm_get_reg’ from incompatible pointer type [-Wincompatible-pointer-types]
   94 |         ret = unw_get_reg(&cursor, regs[i].regnum, &val);
      |                                                    ^~~~
      |                                                    |
      |                                                    uint64_t * {aka long long unsigned int *}
```
Switched to libunwind's un_word_t type and PRIxPTR fprintf fmt specification

Part-of: <https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/1763>
(cherry picked from commit e0588d2110)

2026-01-25 10:40:00 -08:00

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