Use the rust-std manifest file in build_llvm_sysroot_for_triple #4257

Job	Run time
rustfmt	13s
test (macos-latest, aarch64-apple-darwin)	11m 44s
bench	6m 48s
test_llvm	3m 53s
test (ubuntu-latest, riscv64gc-unknown-linux-gnu, gcc-riscv64-linux-gnu qemu-user)	4m 11s
test (macos-15-intel, x86_64-apple-darwin)	22m 29s
test (ubuntu-24.04-arm, aarch64-unknown-linux-gnu)	9m 39s
test (ubuntu-latest, x86_64-unknown-linux-gnu)	12m 16s
dist (macos-latest, aarch64-apple-darwin)	2m 39s
test (ubuntu-latest, s390x-unknown-linux-gnu, gcc-s390x-linux-gnu qemu-user)	4m 12s
test (windows-latest, x86_64-pc-windows-gnu)	27m 53s
test (windows-latest, x86_64-pc-windows-msvc)	19m 14s
dist (ubuntu-24.04-arm, aarch64-unknown-linux-gnu)	1m 38s
dist (windows-latest, x86_64-pc-windows-gnu)	3m 20s
dist (ubuntu-22.04, x86_64-unknown-linux-gnu)	1m 50s
dist (windows-latest, x86_64-pc-windows-msvc)	2m 44s
dist (macos-15-intel, x86_64-apple-darwin)	4m 12s
release	19s
	2h 19m 14s

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