[WRAPPER] Add arc4random to libc

[yzewei]

Add arc4random to libc to allow x86_64 NumPy wheels to load.

[yzewei]

CI failed because rebuild_wrappers.py doesn't know LA64_ABI_1 without the CMake change, need https://github.com/ptitSeb/box64/pull/3371

[ksco]

It's simple enough and related, please put it in this PR for the ease of merging.

[yzewei]

It's simple enough and related, please put it in this PR for the ease of merging.

OK

[ptitSeb]

But what about #3367 ?

[yzewei]

But what about #3367 ?

This PR is a minimal workaround for the missing symbol I hit in practice: only arc4random was unresolved on LA64 ABI1/glibc, and other arc4random_* weren’t referenced. So I only wrapped arc4random to keep the change small.

#3367 is still valid and not fully addressed here. fixed in #3373

[ptitSeb]

Please do not introduce a my_ specific to a system. Instead, create a weak version of the arc4random in libc.c, like I have done previously for strlcpy and __strlcpy_chk so the fix is more generic.