Made recfib benchmark faster #1227

Job	Run time
build-macos-14	11s
build-macos-13	22s
build-macos-12	21s
build-macos-11	21s
Build stdlib from source (gcc, make)	15s
wasm-clang-make	15s
ubuntu-22.04-clang-make	24s
Build stdlib from source (gcc, bmake)	19s
ubuntu-22.04-gcc-make	10s
Clang - static analysis	35s
ubuntu-20.04-clang-make	12s
windows-2019-mingw64	1m 28s
Valgrind - memory leak check	28s
ubuntu-20.04-gcc-make	9s
windows-2019-mingw32	1m 24s
ubuntu-22.04-gcc-bmake	13s
windows-2019-ucrt64	1m 26s
windows-2019-clang64	1m 24s
windows-2019-clang32	1m 29s
windows-2022-mingw64	1m 30s
windows-2022-mingw32	1m 26s
windows-2022-ucrt64	1m 31s
windows-2022-clang64	1m 24s
windows-2022-clang32	1m 34s
Static checks	3s
release-linux	1m 35s
release-mingw32-windows	1m 37s
release.musl-linux	1m 41s
release-mingw64-windows	1m 44s
release-ucrt64-windows	1m 36s
release.wasm	29s
release-macos	31s
release-clang64-windows	1m 37s
release-clang32-windows	1m 39s
	31m 23s

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