Versions before 144 vendor bindgen 0.69, which emits invalid Rust for
libc++ 21's attributed basic_string::__self_view alias on Darwin.
This was exposed by commit 0758fc3add ("darwin.libcxx:
20.1.0+apple-sdk-26.0 -> 21.1.6+apple-sdk-26.4"), where libc++
changed `basic_string::__self_view` from a typedef to an attributed
`using` alias. bindgen then drops the alias template parameter and emits
`basic_string___self_view = ...<_CharT>`.
The solution is to blocklist the unused `string_view` internals for the
profiler Rust API. They are not used in the actual build.
Note: Mozilla 144 updated vendored bindgen via:
https://bugzilla.mozilla.org/show_bug.cgi?id=1985509
Assisted-by: Codex gpt-5.5 xhigh
