SDL_MemoryMapFile implementation #1490

Job	Run time
Create test plan	5s
level1 / Haiku	1m 39s
level2 / Windows (msys2, clang32)	2m 57s
level2 / RISC OS	1m 21s
level2 / FreeBSD	3m 38s
level2 / Android (CMake)	3m 8s
level2 / Sony PlayStation Portable	3m 37s
level2 / MacOS (GNU prefix)	4m 14s
level2 / Ubuntu 20.04	4m 27s
level2 / PowerPC64	2m 15s
level2 / Nintendo 3DS	55s
level2 / Sony PlayStation Vita (GLES w/ PVR_PSP2)	3m 13s
level2 / Sony PlayStation 2	4m 37s
level2 / Ubuntu 22.04	4m 29s
level2 / iOS (CMake & xcode)	2m 2s
level2 / Android (Gradle)	2m 7s
level2 / Ubuntu 20.04 (Intel oneAPI)	6m 25s
level2 / Sony PlayStation Vita (GLES w/ pib)	3m 5s
level2 / Windows (MSVC, clang-cl x86)	3m 18s
level2 / GDK (MSVC, x64)	2m 47s
level2 / MacOS (Framework) (x64)	5m 8s
level2 / MacOS (Framework) (arm64)	2m 52s
level2 / Ubuntu 20.04 (Intel Compiler)	4m 30s
level2 / Android (CMake, lean)	3m 2s
level2 / Android (Android.mk)	1m 13s
level2 / Windows (msys2, ucrt64)	3m 41s
level2 / tvOS (CMake & xcode)	2m 19s
level2 / Windows (MSVC, ARM64)	1m 24s
level2 / Windows (MSVC, clang-cl x64)	2m 36s
level2 / Windows (MSVC, x64)	1m 19s
level2 / NetBSD	2m 42s
level2 / Windows (MSVC, ARM)	1m 49s
level2 / LoongArch64	2m 43s
level2 / Windows (MSVC, x86)	1m 58s
level2 / Windows (msys2, mingw32)	3m 36s
level2 / Windows (msys2, mingw64)	3m 27s
level2 / Emscripten	9m 14s
level2 / Windows (msys2, clang64)	2m 39s
	1h 56m 31s

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