cleanup: Remove patched `cc-rs` revision from bootstrap after `armv7a-vex-v5` target is merged.

[Tropix126]

cc-rs currently retrieves a list of target specifications from the latest nightly build of rustc, making it impossible to bootstrap new targets without using a patched version of the cc dependency. This is the case with #131530, which adds the armv7a-vex-v5 T3 target. After the PR is merged/approved and a nightly is released and whatnot, the revision should be removed.

See https://github.com/rust-lang/rust/pull/131530/files#diff-bc6db3ba5470d55424f84b8accb942d6b65345d468c6e8e330e17b692fea09cbR102

[Tropix126]

This also applies to src/tools/tidy, see the review at https://github.com/rust-lang/rust/pull/131530/files#diff-d642ecacb161b068b8a3f539811356ccec69c5da1604182bb775ab46e1f891ddR12

[Tropix126]

Closing due to #131530 being closed and hopefully split into smaller changes in the future. My hope is that targets won't have to patch cc-rs through bootstrap by the time the compiler-side of this work is ready for review, but this may need to be addressed again once that PR is opened.