display_sdl: Add SDL_SetWindowKeyboardGrab. #1160

Job	Run time
build-windows-msys2	3m 21s
build-macos (macos-latest, arm64, /opt/homebrew)	2m 15s
build-macos (macos-15-intel, x86_64, /usr/local)	3m 25s
build-linux	1m 51s
build-windows-vsbuild (clang, Ninja, -DCMAKE_C_COMPILER=clang-cl -DCMAKE_CXX_COMPILER=clang-cl, -...	3m 56s
build-windows-vsbuild (msvc, Ninja, -DCMAKE_C_COMPILER_LAUNCHER=ccache -DCMAKE_CXX_COMPILER_LAUNC...	4m 27s
build-windows-vsbuild (msbuild, Visual Studio 17 2022, MSBUILD)	4m 47s
	24m 2s

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