Expose RANDOMX_SCRATCHPAD_L3 as a function #20

Job	Run time
build-ubuntu (ubuntu-20.04, gcc-11, g++-11)	35s
build-macos (macos-11)	1s
build-freebsd (freebsd, x86-64, 13.2, ubuntu-22.04)	5m 21s
build-ubuntu (ubuntu-22.04, gcc-12, g++-12)	26s
build-macos (macos-12)	1s
build-alpine (x86_64, latest-stable)	24s
build-freebsd (freebsd, arm64, 13.2, ubuntu-22.04)	5m 42s
build-macos (macos-13)	28s
build-alpine (x86, latest-stable)	20s
build-windows-msbuild (x64, 2019, Visual Studio 16 2019, C:\Program Files (x86)\Microsoft Visual ...	2m 1s
build-alpine (aarch64, latest-stable)	2m 11s
build-windows-msbuild (x64, 2022, Visual Studio 17 2022, C:\Program Files\Microsoft Visual Studio...	1m 9s
build-windows-msys2 (gcc, g++)	1m 43s
build-alpine (armhf, latest-stable)	1m 53s
build-windows-msbuild (Win32, 2019, Visual Studio 16 2019, C:\Program Files (x86)\Microsoft Visua...	1m 24s
build-alpine (armv7, latest-stable)	1m 47s
build-windows-msys2 (clang, clang++)	1m 45s
build-windows-msbuild (Win32, 2022, Visual Studio 17 2022, C:\Program Files\Microsoft Visual Stud...	1m 44s
build-alpine (ppc64le, latest-stable)	1m 43s
build-alpine (riscv64, edge)	1m 55s
build-alpine (s390x, latest-stable)	2m 2s
	34m 35s

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