Bug#994501: llvm-toolchain-9: autopkgtest regression with CMake 3.19+

[Timo Röhling]

Package: src:llvm-toolchain-9
Version: 1:9.0.1-16.1
Tag: patch

Dear maintainers,

the new upstream release of CMake introduced a deprecation warning
if cmake_minimum_required() requests a minimum version below 2.8.12.
This makes the autopkgtest suite of llvm-toolchain-9 fail due to unexpected
stderr output.

Attached is a patch that bumps the minimum version to something
reasonably recent, i.e. the current oldoldstable version of CMake.

Cheers
Timo

-- 
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⣾⠁⢠⠒⠀⣿⡁   │ Timo Röhling                                       │
⢿⡄⠘⠷⠚⠋⠀   │ 9B03 EBB9 8300 DF97 C2B1  23BF CC8C 6BDD 1403 F4CA │
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