options/posix: Add bzero #3328

Job	Run time
Build mlibc (x86_64, mlibc)	3m 25s
Build mlibc (x86_64, mlibc-static)	2m 59s
Build mlibc (x86_64, mlibc-shared)	3m 23s
Build mlibc (x86_64, mlibc-ansi-only)	3m 4s
Build mlibc (x86_64, mlibc-headers-only)	1m 59s
Build mlibc (riscv64, mlibc)	3m 25s
Build mlibc (riscv64, mlibc-static)	4m 36s
Build mlibc (riscv64, mlibc-shared)	3m 1s
Build mlibc (riscv64, mlibc-ansi-only)	2m 43s
Build mlibc (riscv64, mlibc-headers-only)	1m 58s
Build mlibc (aarch64, mlibc)	3m 46s
Build mlibc (aarch64, mlibc-static)	2m 59s
Build mlibc (aarch64, mlibc-shared)	2m 59s
Build mlibc (aarch64, mlibc-ansi-only)	3m 1s
Build mlibc (aarch64, mlibc-headers-only)	2m 2s
Build mlibc (x86, mlibc)	3m 47s
Build mlibc (x86, mlibc-static)	3m 8s
Compile sysdeps (dripos)	2m 42s
Build mlibc (x86, mlibc-shared)	3m 5s
Compile sysdeps (lemon)	2m 17s
Build mlibc (x86, mlibc-ansi-only)	2m 55s
Compile sysdeps (aero)	2m 12s
Build mlibc (x86, mlibc-headers-only)	1m 58s
Compile sysdeps (ironclad)	2m 39s
Compile sysdeps (lyre)	2m 18s
Compile sysdeps (keyronex)	2m 22s
	1h 14m 43s

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