Merging to utilize cmake SDK unification and github workflow fix for Ubuntu removing Azure conflict.

[timfox]

Note

Modernizes build system and CI to reduce external dependencies and fix Linux runner issues.

• Inlines a minimal FindSDL2 implementation into CMakeLists.txt, removes cmake_modules/FindSDL2.cmake, standardizes SDL2::Core/SDL2::Main targets, hard-fails when SDL2 is not found, and supports SDL2_PATH (used on macOS/Homebrew)
• Changes default SKIP_IDPAK_CHECK to ON
• CI: On Ubuntu runners, removes conflicting Azure/Microsoft APT sources before installs; retains 32-bit deps for x86 and standard deps for x86_64/arm64; macOS builds pass SDL2_PATH from Homebrew

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SDL2_PATH CMake variable ignored, breaking macOS builds

High Severity

The inline SDL2 finder uses $ENV{SDL2_PATH} (environment variable) but the macOS CI workflow passes -DSDL2_PATH="${SDL2_PREFIX}" (CMake cache variable). These are different namespaces, so the Homebrew SDL2 path won't be used. Since /opt/homebrew (Apple Silicon Homebrew prefix) isn't in the hardcoded hint paths, macOS builds will fail to find SDL2.

 

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FreeBSD SDL2 library name typo breaks discovery

Medium Severity

The SDL2 library name list contains SDL2-2.0 but the FreeBSD ports system uses SDL-2.0 (without the extra 2 before the dash). The deleted FindSDL2.cmake had the correct name with a comment explaining "SDL-2.0 is the name used by FreeBSD ports... don't confuse it for the version number." This typo will cause FreeBSD builds to fail finding SDL2.