New package libsdl3

Whilst it is pre-release, it has declared to have stable abi https://github.com/libsdl-org/SDL/releases/tag/preview-3.1.3

And we are starting to see cutting edge software releases that require
libsdl3. It is likely that libsdl2 will be required for a long time,
even when libsdl3 goes stable.

Package both during this transition period.

Needed for:
- #27343

libsdl3.yaml

@@ -0,0 +1,57 @@
+package:
+ name: libsdl3
+ version: 3.1.3
+ epoch: 0
+ description: Simple DirectMedia Layer is a cross-platform development library designed to provide low level access to audio, keyboard, mouse, joystick, and graphics hardware via OpenGL and Direct3D.
+ copyright:
+ - license: Zlib
+
+environment:
+ contents:
+ packages:
+ - build-base
+ - busybox
+ - ca-certificates-bundle
+ - openssf-compiler-options
+
+pipeline:
+ - uses: git-checkout
+ with:
+ repository: https://github.com/libsdl-org/SDL
+ tag: preview-${{package.version}}
+ expected-commit: e292d1f5ace469f718d7b6b4dec8c28e37dcaa0e
+
+ - uses: cmake/configure
+
+ - uses: cmake/build
+
+ - uses: cmake/install
+
+subpackages:
+ - name: ${{package.name}}-dev
+ dependencies:
+ runtime:
+ - libsdl3
+ pipeline:
+ - uses: split/dev
+
+ - name: ${{package.name}}-doc
+ pipeline:
+ - uses: split/dev
+
+update:
+ enabled: true
+ github:
+ identifier: libsdl-org/SDL
+ strip-prefix: preview-
+
+test:
+ environment:
+ contents:
+ packages:
+ - ${{package.name}}-dev
+ - pkgconf
+ pipeline:
+ - runs: |
+ set -euo pipefail
+ pkg-config --modversion sdl3 | grep -q "${{package.version}}"