Bug#994500: libsfml: autopkgtest regression with CMake 3.19+

[Timo Röhling]

Package: src:libsfml
Version: 2.5.1+dfsg-1
Tag: patch

Dear maintainer,

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 libsfml 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                                       │
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