Revert "smalloc: smalloc() already clears memory, scalloc() need not … #851

Job	Run time
build (linux-gcc)	9m 10s
build (linux-gcc)	9m 10s
build (linux-clang)	9m 57s
build (linux-clang)	10m 40s
build (macos)	7m 55s
build (macos)	7m 55s
build (linux-i686-gcc)	8m 37s
build (linux-i686-gcc)	8m 37s
build (android)	39s
build (android)	39s
build (windows-cygwin-64)	11m 9s
build (windows-cygwin-64)	11m 9s
build (windows-cygwin-32)	2m 46s
build (windows-cygwin-32)	3m 47s
build (windows-msys2-64)	10m 37s
build (windows-msys2-64)	10m 37s
build (android-recovery, ubuntu-22.04, aarch64-linux-android32)	38s
build (android-recovery, ubuntu-22.04, aarch64-linux-android32)	38s
	2h 4m 40s

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