rtld: Add list of supported DT_FLAGS{,_1} to ignore #4050

Job	Run time
Compile sysdeps (dripos)	2m 47s
Compile sysdeps (lemon)	2m 44s
Compile sysdeps (aero)	2m 49s
Compile sysdeps (ironclad)	2m 45s
Build mlibc (x86_64, mlibc, gcc)	1s
Compile sysdeps (lyre)	2m 41s
Build mlibc (x86_64, mlibc-static, gcc)	1s
Compile sysdeps (keyronex)	2m 45s
Build mlibc (x86_64, mlibc-shared, gcc)	1s
Compile sysdeps (managarm)	3m 1s
Build mlibc (x86_64, mlibc-ansi-only, gcc)	1s
Compile sysdeps (vinix)	2m 45s
Build mlibc (x86_64, mlibc-headers-only, gcc)	1s
Compile sysdeps (astral)	2m 42s
Build mlibc (riscv64, mlibc, gcc)	11s
Build mlibc (riscv64, mlibc-static, gcc)	1s
Build mlibc (riscv64, mlibc-shared, gcc)	1s
Build mlibc (riscv64, mlibc-ansi-only, gcc)	10s
Build mlibc (riscv64, mlibc-headers-only, gcc)	1s
Build mlibc (aarch64, mlibc, gcc)	2m 46s
Build mlibc (aarch64, mlibc-static, gcc)	2m 48s
Build mlibc (aarch64, mlibc-shared, gcc)	2m 43s
Build mlibc (aarch64, mlibc-ansi-only, gcc)	2m 48s
Build mlibc (aarch64, mlibc-headers-only, gcc)	2m 25s
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 47s
Build mlibc (m68k, mlibc-static, gcc)	14s
Build mlibc (m68k, mlibc-shared, gcc)	2m 11s
Build mlibc (m68k, mlibc-ansi-only, gcc)	2m 34s
Build mlibc (m68k, mlibc-headers-only, gcc)	2m 19s
Build mlibc (x86_64, mlibc, clang)	1s
	49m 9s

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