Implement various syscalls on Linux for systemd #4207

Job	Run time
Compile sysdeps (dripos)	2m 13s
Compile sysdeps (lemon)	2m 15s
Build mlibc (x86_64, mlibc, gcc)	12s
Compile sysdeps (aero)	2m 10s
Build mlibc (x86_64, mlibc-static, gcc)	1s
Compile sysdeps (ironclad)	2m 15s
Build mlibc (x86_64, mlibc-shared, gcc)	1s
Compile sysdeps (lyre)	2m 13s
Build mlibc (x86_64, mlibc-ansi-only, gcc)	1s
Compile sysdeps (keyronex)	2m 16s
Build mlibc (x86_64, mlibc-headers-only, gcc)	1s
Compile sysdeps (managarm)	2m 19s
Build mlibc (riscv64, mlibc, gcc)	24s
Compile sysdeps (vinix)	2m 12s
Build mlibc (riscv64, mlibc-static, gcc)	17s
Compile sysdeps (astral)	2m 10s
Build mlibc (riscv64, mlibc-shared, gcc)	19s
Build mlibc (riscv64, mlibc-ansi-only, gcc)	23s
Build mlibc (riscv64, mlibc-headers-only, gcc)	20s
Build mlibc (aarch64, mlibc, gcc)	2m 40s
Build mlibc (aarch64, mlibc-static, gcc)	2m 38s
Build mlibc (aarch64, mlibc-shared, gcc)	2m 43s
Build mlibc (aarch64, mlibc-ansi-only, gcc)	2m 46s
Build mlibc (aarch64, mlibc-headers-only, gcc)	2m 10s
Build mlibc (x86, mlibc, gcc)	1s
Build mlibc (x86, mlibc-static, gcc)	1s
Build mlibc (x86, mlibc-shared, gcc)	1s
Build mlibc (x86, mlibc-ansi-only, gcc)	1s
Build mlibc (x86, mlibc-headers-only, gcc)	1s
Build mlibc (m68k, mlibc, gcc)	2m 40s
Build mlibc (m68k, mlibc-static, gcc)	27s
Build mlibc (m68k, mlibc-shared, gcc)	2m 22s
Build mlibc (m68k, mlibc-ansi-only, gcc)	2m 42s
Build mlibc (m68k, mlibc-headers-only, gcc)	1m 58s
Build mlibc (x86_64, mlibc, clang)	3s
	45m 16s

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