abis/linux: Add some defines needed for systemd #4208

Job	Run time
Compile sysdeps (dripos)	2m 24s
Compile sysdeps (lemon)	2m 25s
Build mlibc (x86_64, mlibc, gcc)	3m 55s
Build mlibc (x86_64, mlibc-static, gcc)	3m 54s
Compile sysdeps (aero)	2m 17s
Build mlibc (x86_64, mlibc-shared, gcc)	3m 14s
Compile sysdeps (ironclad)	2m 21s
Build mlibc (x86_64, mlibc-ansi-only, gcc)	3m 6s
Compile sysdeps (lyre)	2m 28s
Build mlibc (x86_64, mlibc-headers-only, gcc)	2m 11s
Compile sysdeps (keyronex)	2m 18s
Build mlibc (riscv64, mlibc, gcc)	3m 46s
Build mlibc (riscv64, mlibc-static, gcc)	4m 38s
Compile sysdeps (managarm)	2m 59s
Build mlibc (riscv64, mlibc-shared, gcc)	3m 18s
Compile sysdeps (vinix)	2m 21s
Build mlibc (riscv64, mlibc-ansi-only, gcc)	3m 1s
Compile sysdeps (astral)	2m 28s
Build mlibc (riscv64, mlibc-headers-only, gcc)	2m 0s
Build mlibc (aarch64, mlibc, gcc)	4m 11s
Build mlibc (aarch64, mlibc-static, gcc)	3m 33s
Build mlibc (aarch64, mlibc-shared, gcc)	3m 31s
Build mlibc (aarch64, mlibc-ansi-only, gcc)	3m 4s
Build mlibc (aarch64, mlibc-headers-only, gcc)	2m 8s
Build mlibc (x86, mlibc, gcc)	4m 6s
Build mlibc (x86, mlibc-static, gcc)	3m 18s
Build mlibc (x86, mlibc-shared, gcc)	3m 21s
Build mlibc (x86, mlibc-ansi-only, gcc)	3m 7s
Build mlibc (x86, mlibc-headers-only, gcc)	2m 4s
Build mlibc (m68k, mlibc, gcc)	3m 39s
Build mlibc (m68k, mlibc-static, gcc)	3m 4s
Build mlibc (m68k, mlibc-shared, gcc)	3m 2s
Build mlibc (m68k, mlibc-ansi-only, gcc)	3m 24s
Build mlibc (m68k, mlibc-headers-only, gcc)	2m 1s
Build mlibc (x86_64, mlibc, clang)	3m 18s
	1h 45m 55s

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