Added new slow test #1240

Job	Run time
Build stdlib from source (gcc, make)	28s
wasm-clang-make	18s
Build stdlib from source (gcc, bmake)	41s
build-macos-14	12s
build-macos-13	17s
ubuntu-22.04-clang-make	1m 0s
build-macos-12	22s
ubuntu-22.04-gcc-make	16s
windows-2019-mingw64	1m 24s
build-macos-11	22s
Clang - static analysis	1m 50s
windows-2019-mingw32	1m 28s
ubuntu-20.04-clang-make	14s
ubuntu-20.04-gcc-make	10s
windows-2019-ucrt64	1m 24s
ubuntu-22.04-gcc-bmake	19s
Valgrind - memory leak check	24s
windows-2019-clang64	1m 23s
windows-2019-clang32	1m 36s
windows-2022-mingw64	1m 34s
windows-2022-mingw32	1m 30s
windows-2022-ucrt64	1m 29s
windows-2022-clang64	1m 32s
windows-2022-clang32	1m 32s
Static checks	3s
release-linux	1m 28s
release.musl-linux	1m 39s
release.wasm	41s
release-macos	20s
release-mingw32-windows	1m 47s
release-mingw64-windows	1m 45s
release-ucrt64-windows	1m 49s
release-clang64-windows	1m 49s
release-clang32-windows	1m 47s
	34m 53s

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