options/rtdl: Implement tlsdesc for x86_64 #3507

Job	Run time
Compile sysdeps (dripos)	2m 3s
Build mlibc (x86_64, mlibc)	3m 21s
Compile sysdeps (lemon)	2m 16s
Build mlibc (x86_64, mlibc-static)	2m 57s
Compile sysdeps (aero)	2m 11s
Build mlibc (x86_64, mlibc-shared)	2m 52s
Compile sysdeps (ironclad)	2m 10s
Build mlibc (x86_64, mlibc-ansi-only)	2m 39s
Build mlibc (x86_64, mlibc-headers-only)	1m 53s
Build mlibc (riscv64, mlibc)	3m 19s
Compile sysdeps (lyre)	2m 8s
Compile sysdeps (keyronex)	2m 19s
Build mlibc (riscv64, mlibc-static)	3m 59s
Compile sysdeps (managarm)	2m 18s
Build mlibc (riscv64, mlibc-shared)	2m 46s
Build mlibc (riscv64, mlibc-ansi-only)	2m 44s
Build mlibc (riscv64, mlibc-headers-only)	1m 53s
Build mlibc (aarch64, mlibc)	3m 38s
Build mlibc (aarch64, mlibc-static)	3m 6s
Build mlibc (aarch64, mlibc-shared)	2m 53s
Build mlibc (aarch64, mlibc-ansi-only)	2m 46s
Build mlibc (aarch64, mlibc-headers-only)	2m 2s
Build mlibc (x86, mlibc)	3m 28s
Build mlibc (x86, mlibc-static)	3m 0s
Build mlibc (x86, mlibc-shared)	2m 56s
Build mlibc (x86, mlibc-ansi-only)	2m 52s
Build mlibc (x86, mlibc-headers-only)	1m 51s
	1h 12m 20s

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