remove temporary compatibility functions.

[happystraw]

• remove resolveCircularTypes

  update to zig 0.16.0-dev.2821+3edaef9e0

• remove zig_zend_string_init and use zend_string_init directly
• enable strict_flex_arrays=1 to ensure correct translation of flexible array members, zend_string_alloc, offset etc.

---

Based on:

1. update to zig 0.16.0-dev.2821+3edaef9e0 Vexu/arocc#975
2. https://codeberg.org/ziglang/translate-c/pulls/302
3. wait or create a pr to update ziglang/translate-c zig/arocc versions