`CARGO_PKG_AUTHORS` is missing in cargo_build_script

[ashi009]

CARGO_PKG_AUTHORS is required by rav1e-0.7.1's build.rs, which panicked for missing this env.

Build script process failed with exit code 101
--stdout:

--stderr:

thread 'main' panicked at external/crate_index__built-0.7.5/src/environment.rs:53:9:
Missing expected environment variable "CARGO_PKG_AUTHORS"
stack backtrace:
   0:        0x1026bd4a8 - <std::sys::backtrace::BacktraceLock::print::DisplayBacktrace as core::fmt::Display>::fmt::h0e008ac854899e18
   1:        0x1026d4a94 - core::fmt::write::h2c21eb14b1dd8ad0
   2:        0x1026bb224 - std::io::Write::write_fmt::h1fdd0180e3c77d24
   3:        0x1026bd35c - std::sys::backtrace::BacktraceLock::print::hb8a77fc26ba5bbdc
   4:        0x1026be234 - std::panicking::default_hook::{{closure}}::h6bf3faf5cf5dae9d
   5:        0x1026be070 - std::panicking::default_hook::heb63235480e1657e
   6:        0x1026bec94 - std::panicking::rust_panic_with_hook::he5e9d1d9e3153170
   7:        0x1026be930 - std::panicking::begin_panic_handler::{{closure}}::hd86605ed3266bb72
   8:        0x1026bd95c - std::sys::backtrace::__rust_end_short_backtrace::hf79a98c26e726fc1
   9:        0x1026be5e8 - _rust_begin_unwind
  10:        0x1026db174 - core::panicking::panic_fmt::hadbabd9ba9c16ff0
  11:        0x1026db154 - core::option::expect_failed::h3362eaa9a8f2c698
  12:        0x1026979c8 - built::environment::EnvironmentMap::write_env::ha536b5b78932e91f
  13:        0x10269b738 - built::write_built_file_with_opts::hd5aa22415c695b99
  14:        0x10269b870 - built::write_built_file::h7f5006d7eb82b252
  15:        0x1026955ac - build_script_build::main::h055766aea2def2dd
  16:        0x1026953f0 - std::sys::backtrace::__rust_begin_short_backtrace::hb2c0d52306705e2d
  17:        0x1026953d8 - std::rt::lang_start::{{closure}}::h966def5ccdd80252
  18:        0x1026b8898 - std::rt::lang_start_internal::h24dbca674d9b5925
  19:        0x102695a08 - _main

[ashi009]

well, it requires way more than CARGO_PKG_AUTHORS:

https://github.com/lukaslueg/built/blob/53719a12eeb1f4afb65411984f437b65d4799d71/src/environment.rs#L164-L217