Update cargo-c to 0.9.1
- Support legacy pre-generated header.name ending with a .h.
- Allow to override the pkg-config filename.
- Allow to override the include subdirectory.
- Make possible to strip components from the -I line in pkg-config.
- Support installing multiple custom headers, pregenerated or generated by build.rs.
- Make sure library name overrides with - are correctly managed.
Test Plan: Rebuilt rav1e with this version.
Reviewers: Triage Team, JoshStrobl
Reviewed By: Triage Team, JoshStrobl
Differential Revision: https://dev.getsol.us/D11418