Revert commit f54ec4e7f9 (libuv: macos: use posix poll instead of
kqueue, 2024-03-31, v3.29.1~7^2) and its parent. It is not necessary
after the kqueue-based implementation was fixed to reap child processes
more reliably.
Issue: #25839
Since commit 5420639a8d (cmExecuteProcessCommand: Replace cmsysProcess
with cmUVProcessChain, 2023-06-01, v3.28.0-rc1~138^2~8) we've observed
spurious process hangs in `uv__io_poll` waiting for `kqueue` to deliver
events on macOS.
Issue: #25839
In commit 714ce72882 (bootstrap: Make libuv available during bootstrap,
2017-09-13, v3.10.0-rc1~106^2) we modified libuv to use POSIX interfaces
during bootstrap. However, some code still expects `TARGET_OS_IPHONE`
to be defined on Apple platforms to either `0` or `1`. In order to
offer this, include `<TargetConditionals.h>` on Apple platforms even
when bootstrapping.
Headers in `uv/` can include each other without the `uv/` prefix. Using
the prefix assumes that the location of `uv/` is in the include file
search path, but it is possible to include `uv.h` via a longer path.
Brad King