Bug#1124627: mawk on arm64 ignores srand(), produces same results for rand()

Package: mawk
Version: 1.3.4.20250131-1
Severity: normal
X-Debbugs-Cc: [email protected], [email protected]
User: [email protected]
Usertags: arm64

Running `mawk 'BEGIN {print rand()}'` on Debian Trixie on arm64,
produces the same results. It is expected (and documented) that srand()
is called implicitly. And on Bookworm or on amd64, this works as
expected. Easy to reproduce using docker:

```
$ docker run -it --rm --platform linux/arm64 debian:trixie sh -c 'for i in 1 2 3 4; do mawk "BEGIN {print rand()}"; sleep 1; done'
0.118709
0.118709
0.118709
0.118709
```

```
$ docker run -it --rm --platform linux/amd64 debian:trixie sh -c 'for i in 1 2 3 4; do mawk "BEGIN {print rand()}"; sleep 1; done'
0.301452
0.968917
0.975551
0.0758413
```

```
$ docker run -it --rm --platform linux/amd64 debian:bookworm sh -c 'for i in 1 2 3 4; do mawk "BEGIN {print rand()}"; sleep 1; done'
0.133928
0.991352
0.852069
0.211199
```

```
$ docker run -it --rm --platform linux/arm64 debian:bookworm sh -c 'for i in 1 2 3 4; do mawk "BEGIN {print rand()}"; sleep 1; done'
0.5202
0.878447
0.73942
0.956202
```


-- System Information:
Debian Release: 13.2
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable-security'), (500, 'stable')
Architecture: arm64 (aarch64)

Kernel: Linux 6.12.57+deb13-amd64 (SMP w/16 CPU threads; PREEMPT)
Kernel taint flags: TAINT_PROPRIETARY_MODULE, TAINT_WARN, TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE
Locale: LANG=C, LC_CTYPE=C.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: unable to detect

Versions of packages mawk depends on:
ii  libc6  2.41-12

mawk recommends no packages.

mawk suggests no packages.

-- no debconf information