[PATCH] bootstrap: tweak verbosity settings

Currently the verbosity settings are:
- 2: RUSTC-SHIM envvars get spammed on every invocation, O(30) lines
     cargo is passed -v which outputs CLI invocations, O(5) lines
- 3: cargo is passed -vv which outputs build script output, O(0-10) lines

This commit changes it to:

- 1: cargo is passed -v, O(5) lines
- 2: cargo is passed -vv, O(10) lines
- 3: RUSTC-SHIM envvars get spammed, O(30) lines

Gbp-Pq: Name u-89950.patch

u-cc-627

Forwarded: https://github.com/alexcrichton/cc-rs/pull/627

Gbp-Pq: Name u-cc-627.patch

u-ignore-endian-big-diff

Bug: https://github.com/rust-lang/rust/issues/89577

Gbp-Pq: Name u-ignore-endian-big-diff.patch

Don't split dwarf debug for a fully-reproducible build

Bug: https://github.com/rust-lang/rust/issues/34902

Gbp-Pq: Name u-reproducible-build.patch

u-ignore-reproducible-failure

Bug: https://github.com/rust-lang/rust/issues/89911

Gbp-Pq: Name u-ignore-reproducible-failure.patch

rustc (1.57.0+dfsg1-1) unstable; urgency=medium

  * Upload to unstable. (Closes: #1005203)

[dgit import unpatched rustc 1.57.0+dfsg1-1]

Import rustc_1.57.0+dfsg1-1.debian.tar.xz

[dgit import tarball rustc 1.57.0+dfsg1-1 rustc_1.57.0+dfsg1-1.debian.tar.xz]

Import rustc_1.57.0+dfsg1.orig.tar.xz

[dgit import orig rustc_1.57.0+dfsg1.orig.tar.xz]