options/posix: Add bcmp() and bcopy() #3338

Job	Run time
Build mlibc (x86_64, mlibc)	3m 38s
Compile sysdeps (dripos)	2m 17s
Compile sysdeps (lemon)	2m 14s
Build mlibc (x86_64, mlibc-static)	2m 56s
Compile sysdeps (aero)	2m 15s
Build mlibc (x86_64, mlibc-shared)	2m 54s
Compile sysdeps (ironclad)	2m 16s
Build mlibc (x86_64, mlibc-ansi-only)	3m 14s
Compile sysdeps (lyre)	2m 13s
Build mlibc (x86_64, mlibc-headers-only)	2m 4s
Compile sysdeps (keyronex)	2m 28s
Build mlibc (riscv64, mlibc)	3m 27s
Build mlibc (riscv64, mlibc-static)	4m 34s
Build mlibc (riscv64, mlibc-shared)	2m 56s
Build mlibc (riscv64, mlibc-ansi-only)	2m 44s
Build mlibc (riscv64, mlibc-headers-only)	1m 52s
Build mlibc (aarch64, mlibc)	3m 43s
Build mlibc (aarch64, mlibc-static)	3m 4s
Build mlibc (aarch64, mlibc-shared)	3m 2s
Build mlibc (aarch64, mlibc-ansi-only)	2m 49s
Build mlibc (aarch64, mlibc-headers-only)	1m 58s
Build mlibc (x86, mlibc)	3m 36s
Build mlibc (x86, mlibc-static)	3m 13s
Build mlibc (x86, mlibc-shared)	3m 7s
Build mlibc (x86, mlibc-ansi-only)	2m 53s
Build mlibc (x86, mlibc-headers-only)	1m 54s
	1h 13m 21s

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