rtld: Use breadth-first search order #4310

Job	Run time
Build mlibc (x86_64, mlibc, gcc)	45s
Compile sysdeps (dripos)	2m 21s
Compile sysdeps (lemon)	2m 21s
Build mlibc (x86_64, mlibc-static, gcc)	41s
Compile sysdeps (aero)	2m 22s
Build mlibc (x86_64, mlibc-shared, gcc)	44s
Compile sysdeps (ironclad)	2m 18s
Build mlibc (x86_64, mlibc-ansi-only, gcc)	45s
Compile sysdeps (lyre)	2m 21s
Compile sysdeps (keyronex)	2m 22s
Build mlibc (x86_64, mlibc-headers-only, gcc)	45s
Compile sysdeps (managarm)	2m 26s
Build mlibc (riscv64, mlibc, gcc)	52s
Compile sysdeps (vinix)	2m 21s
Build mlibc (riscv64, mlibc-static, gcc)	45s
Compile sysdeps (astral)	2m 22s
Build mlibc (riscv64, mlibc-shared, gcc)	47s
Build mlibc (riscv64, mlibc-ansi-only, gcc)	54s
Build mlibc (riscv64, mlibc-headers-only, gcc)	52s
Build mlibc (aarch64, mlibc, gcc)	3m 15s
Build mlibc (aarch64, mlibc-static, gcc)	3m 15s
Build mlibc (aarch64, mlibc-shared, gcc)	3m 9s
Build mlibc (aarch64, mlibc-ansi-only, gcc)	3m 10s
Build mlibc (aarch64, mlibc-headers-only, gcc)	2m 8s
Build mlibc (x86, mlibc, gcc)	17s
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)	3m 14s
Build mlibc (m68k, mlibc-static, gcc)	59s
Build mlibc (m68k, mlibc-shared, gcc)	59s
Build mlibc (m68k, mlibc-ansi-only, gcc)	2m 49s
Build mlibc (m68k, mlibc-headers-only, gcc)	1m 58s
Build mlibc (x86_64, mlibc, clang)	47s
	55m 8s

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