Transition: llvm-toolchain 11 removal

Dependency level 1 (build logs RC bugs)		amd64	arm64	armel	armhf	i386	mips64el	mipsel	ppc64el	s390x
clazy (sid only)	[build logs] (1.10-2)					✘
codelite (sid only)	[build logs] (14.0+dfsg-1)	✘	✘	✘	✘	✘		✘
doxygen	[build logs] (1.9.1-2)	✘	✘	✘	✘	✘	✘	✘	✘	✘
iwyu	[build logs] (8.17-1)	✘	✘	✘	✘	✘	✘		✘	✘
ldc	[build logs] (1:1.28.0-2) [ma:same]	✘	✘		✘	✘
llvm-toolchain-11	[build logs] (1:11.1.0-4) [ma:same]	✘	✘	✘	✘	✘	✘	✘	✘	✘
nvidia-cuda-toolkit	[build logs] (11.4.3-1) [ma:same]	✘	✘						✘
rust-bindgen	[build logs] (0.59.1-2) [ma:same]	✘	✘	✘	✘	✘	✘	✘	✘	✘
Dependency level 2 (build logs RC bugs)		amd64	arm64	armel	armhf	i386	mips64el	mipsel	ppc64el	s390x
bpftrace	[build logs] (0.14.1-1)	✘	✘						✘	✘
castxml	[build logs] (0.3.6-2)	✘	✘	✘	✘	✘	✘	✘	✘	✘
creduce (sid only)	[build logs] (2.10.0+20201029-3)	✘	✘			✘	✘	✘	✘	✘
ghc	[build logs] (8.8.4-3)		✘	✘	✘
llvmlite	[build logs] (0.38.0-1)	✘	✘	✘	✘	✘	✘	✘	✘	✘
pocl	[build logs] (1.8-3) [ma:same]	✘	✘	✘	✘	✘

Collisions:

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