www/deno: enable Temporal, fix deno compileHEADmain

- Re-enable Temporal support in V8.  Use the cargo-vendored
  temporal_capi crate instead of building it with GN, which would need
  the Chromium Rust toolchain; a static library built from it in
  pre-build is linked into mksnapshot.
- Fix executables produced by `deno compile`, which failed with
  "Exec format error": libsui relocated the program header table past
  the first page, which the FreeBSD kernel rejects.  For executables,
  store the payload in a non-allocated section and read it back from
  the file instead.
- Implement os.cpus() with sysctl(3) instead of returning dummy
  values, and process.title with setproctitle(3).
- Use system sqlite3, libffi, libdeflate and liblzma instead of
  bundled copies.
- Drop unused openssl crates from CARGO_CRATES; they were only needed
  by keyring's vendored feature, which is already disabled.
- Remove obsolete patches for the release channel and tsgo.

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