options/posix: Add bcmp() and bcopy() #3337

Job	Run time
Build mlibc (x86_64, mlibc)	3m 49s
Compile sysdeps (dripos)	2m 11s
Build mlibc (x86_64, mlibc-static)	2m 56s
Compile sysdeps (lemon)	2m 23s
Build mlibc (x86_64, mlibc-shared)	2m 53s
Compile sysdeps (aero)	2m 16s
Build mlibc (x86_64, mlibc-ansi-only)	2m 52s
Compile sysdeps (ironclad)	2m 18s
Compile sysdeps (lyre)	2m 21s
Build mlibc (x86_64, mlibc-headers-only)	1m 54s
Compile sysdeps (keyronex)	2m 23s
Build mlibc (riscv64, mlibc)	3m 29s
Build mlibc (riscv64, mlibc-static)	4m 33s
Build mlibc (riscv64, mlibc-shared)	3m 18s
Build mlibc (riscv64, mlibc-ansi-only)	2m 45s
Build mlibc (riscv64, mlibc-headers-only)	1m 57s
Build mlibc (aarch64, mlibc)	3m 49s
Build mlibc (aarch64, mlibc-static)	3m 7s
Build mlibc (aarch64, mlibc-shared)	3m 0s
Build mlibc (aarch64, mlibc-ansi-only)	3m 27s
Build mlibc (aarch64, mlibc-headers-only)	2m 7s
Build mlibc (x86, mlibc)	3m 34s
Build mlibc (x86, mlibc-static)	3m 2s
Build mlibc (x86, mlibc-shared)	3m 18s
Build mlibc (x86, mlibc-ansi-only)	2m 52s
Build mlibc (x86, mlibc-headers-only)	1m 58s
	1h 14m 32s

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