PTHREAD_STACK_MIN is an alias for __sysconf(__SC_THREAD_STACK_MIN_VALUE)
in glibc 2.34.

__sysconf() returns long, causing a -Werror,-Wsign-compare error build
error.

Change-Id: I15da8e7ee57a6979682ff7166990698965481586
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3301464
Commit-Queue: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/main@{#78097}