Get Zed headless server building on illumos

[sunshowers]

(1) libc change

• get [solarish/freebsd] add a few missing constants and functions rust-lang/libc#3936 landed
• -> pick [solarish/freebsd] add a few missing constants and functions rust-lang/libc#3936 to libc-0.2
• -> wait for libc-0.2 release

(1) -> (2) ipc-channel

• -> get ipc-channel change landed
  • Use more constants and functions from libc servo/ipc-channel#368
  • Use get_max_fragment_size for medium_data tests servo/ipc-channel#369
  • Accept EINVAL errors in make_socket_lingering servo/ipc-channel#370
  • one more for illumos support that depends on all of the above
• -> wait for ipc-channel release

(1) -> (3) rustix

• -> get rustix change landed: Add O_RSYNC + fallocate on solarish, and fadvise on illumos bytecodealliance/rustix#1191
• -> pick change to rustix-0.38 branch: Backport patches to the 0.38 branch bytecodealliance/rustix#1192
• -> wait for rustix 0.38 release

(3) -> (4) cap-primitives

• -> get cap-primitives change landed
• -> pick cap-primitives change?
• -> wait for cap-primitives to release

(4) -> (5) wasmtime

• -> get wasmtime change landed
• -> wait for wasmtime to release

(1) -> (6) notify

• -> get notify change landed
• -> wait for notify to release

zed itself

TODO:

• figure out wasmtime status, is it going to be removed
• text system stuff, currently have a no-op impl
• fs monitoring -- currently disabled the impl