mozilla-central build regressed (bisected)

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From: Evgeniy Khramtsov via freebsd-gecko <freebsd-gecko_at_FreeBSD.org>
Date: Mon, 01 Nov 2021 17:44:24 UTC
12.2/amd64 jail can't build mozilla-central after upstream bug 1719546:

[...]
[style 0.0.1] /wrkdirs/usr/ports/www/firefox/work/.build/dist/include/mozilla/intl/ICU4CGlue.h:8:10: fatal error: 'unicode/uenum.h' file not found, err: true
[style 0.0.1] thread 'main' panicked at 'Failed to generate bindings
[...]
[style 0.0.1] stack backtrace:
[style 0.0.1]    0:           0x6d9706 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h1b1738ced3014e00
[style 0.0.1]    1:           0x70d38c - core::fmt::write::he9eee46e1d6b4c4b                                                                                                              [style 0.0.1]    2:           0x6c7685 - std::io::Write::write_fmt::h7bad7a62fcb109ef
[style 0.0.1]    3:           0x6cd09b - std::panicking::default_hook::{{closure}}::he1ca97accdf6a720
[style 0.0.1]    4:           0x6ccc11 - std::panicking::default_hook::h02a0f4800af6a4bf
[style 0.0.1]    5:           0x6cd763 - std::panicking::rust_panic_with_hook::h122a9d3dbcc17bb8
[style 0.0.1]    6:           0x6d9ec0 - std::panicking::begin_panic_handler::{{closure}}::h2fadaec6e70ff98c
[style 0.0.1]    7:           0x6d9834 - std::sys_common::backtrace::__rust_end_short_backtrace::h088847d52f0d6e83
[style 0.0.1]    8:           0x6cd272 - rust_begin_unwind                                                                                                                                [style 0.0.1]    9:           0x6cd22b - std::panicking::begin_panic_fmt::h47ab5a14ff9f6e42                                                                                               [style 0.0.1]   10:           0x43c086 - build_script_build::build_gecko::write_binding_file::h7b7cc0ca6ff28677
[style 0.0.1]   11:           0x43c5f9 - build_script_build::build_gecko::generate_structs::hc5e0e57e57273603
[style 0.0.1]   12:           0x43cd3c - build_script_build::build_gecko::generate::h1555583ef2629eb1
[style 0.0.1]   13:           0x436ca4 - build_script_build::main::hdbc8a2c9ad6c57b5
[style 0.0.1]   14:           0x441ea3 - core::ops::function::FnOnce::call_once::h20f6fe7ea27f866b
[style 0.0.1]   15:           0x441e96 - std::sys_common::backtrace::__rust_begin_short_backtrace::h5d784d24e9b5654c                                                                      [style 0.0.1]   16:           0x4321f9 - std::rt::lang_start::{{closure}}::h37036a17aa0a60ce
[style 0.0.1]   17:           0x6d9f31 - std::rt::lang_start_internal::hed5448c7acecc2aa
[style 0.0.1]   18:           0x4321eb - std::rt::lang_start::hde42783dba7fcaaa
[style 0.0.1]   19:           0x436d13 - main
[style 0.0.1]   20:           0x42b200 - _start                                                                                                                                           [style 0.0.1]                                at /usr/src/lib/csu/amd64/crt1.c:76:7
error: failed to run custom build command for `style v0.0.1 (/wrkdirs/usr/ports/www/firefox/work/mozilla-central-0f203e8e17f9f7a17124191e3e33d05e83c90f27/servo/components/style)`
[...]
  /wrkdirs/usr/ports/www/firefox/work/.build/dist/include/mozilla/intl/ICU4CGlue.h:8:10: fatal error: 'unicode/uenum.h' file not found
[...]

Last good: https://hg.mozilla.org/mozilla-central/rev/bde13f051e7398e5581c2f8d082757133a35059f
Three changesets after bde13f051e... are upstream bug 1719546 and cause
build failure. I don't have time to build each part of 1719546 to point
at the specific changeset, and to look into this.