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

rustc (1.43.0+dfsg1-1) unstable; urgency=medium

  * Upload to unstable.
  * Bump LLVM B-D version for some backported fixes affecting rustc.

[dgit import unpatched rustc 1.43.0+dfsg1-1]

Import rustc_1.43.0+dfsg1-1.debian.tar.xz

[dgit import tarball rustc 1.43.0+dfsg1-1 rustc_1.43.0+dfsg1-1.debian.tar.xz]

Import rustc_1.43.0+dfsg1.orig.tar.xz

[dgit import orig rustc_1.43.0+dfsg1.orig.tar.xz]