openkal compatibility: the measurement of 2026-09-17

Measured by openkal-compat run 35222831479 with mcpp 2026.9.17.3,
openkal-llvm-runtime 0.10.0 and llvm@22.1.8, the host's mingw headers installed.
x86_64-linux-gnu: 27 members run, 3 fail (cmp-module and curl name Linux kernel
headers or epoll, which openkal does not provide; expat calls arc4random_buf,
which musl does not declare). x86_64-windows-gnu, run through Wine: 15 run,
15 fail, each on a Windows or MinGW header its package includes on _WIN32.

Author: Sunrisepeak