lang/rust-bootstrap: Try to unbreak powerpc build
Use ld.bfd from powerpc-binutils similar to lang/rust.
ld: error: rustc_hir_pretty.7ep572vg-cgu.0:(function rustc_hir_pretty::State::print_item::h993c6db847753592: .text._ZN16rustc_hir_pretty5State10print_item17h993c6db847753592E+0x55C): relocation R_PPC_PLTREL24 out of range: -33554484 is not in [-33554432, 33554431]
ld: error: rustc_hir_pretty.7ep572vg-cgu.0:(function rustc_hir_pretty::State::print_block_with_attrs::h3e09891900cd2aa9: .text._ZN16rustc_hir_pretty5State22print_block_with_attrs17h3e09891900cd2aa9E+0x2C): relocation R_PPC_PLTREL24 out of range: -33569004 is not in [-33554432, 33554431]
ld: error: rustc_hir_pretty.7ep572vg-cgu.0:(function rustc_hir_pretty::State::print_item::h993c6db847753592: .text._ZN16rustc_hir_pretty5State10print_item17h993c6db847753592E+0x664): relocation R_PPC_PLTREL24 out of range: -33554732 is not in [-33554432, 33554431]
ld: error: rustc_hir_pretty.7ep572vg-cgu.0:(function rustc_hir_pretty::State::print_block_maybe_unclosed::h3b0ddc7248032a61: .text._ZN16rustc_hir_pretty5State26print_block_maybe_unclosed17h3b0ddc7248032a61E+0xDC): relocation R_PPC_PLTREL24 out of range: -33570260 is not in [-33554432, 33554431]
ld: error: rustc_hir_pretty.7ep572vg-cgu.0:(function rustc_hir_pretty::State::print_item::h993c6db847753592: .text._ZN16rustc_hir_pretty5State10print_item17h993c6db847753592E+0x698): relocation R_PPC_PLTREL24 out of range: -33554800 is not in [-33554432, 33554431]
ld: error: rustc_hir_pretty.7ep572vg-cgu.0:(function rustc_hir_pretty::State::print_block_maybe_unclosed::h3b0ddc7248032a61: .text._ZN16rustc_hir_pretty5State26print_block_maybe_unclosed17h3b0ddc7248032a61E+0xE4): relocation R_PPC_PLTREL24 out of range: -33570108 is not in [-33554432, 33554431]
ld: error: rustc_hir_pretty.7ep572vg-cgu.0:(function rustc_hir_pretty::State::print_item::h993c6db847753592: .text._ZN16rustc_hir_pretty5State10print_item17h993c6db847753592E+0x6EC): relocation R_PPC_PLTREL24 out of range: -33554884 is not in [-33554432, 33554431]
ld: error: rustc_hir_pretty.7ep572vg-cgu.0:(function rustc_hir_pretty::State::print_item::h993c6db847753592: .text._ZN16rustc_hir_pretty5State10print_item17h993c6db847753592E+0x6F4): relocation R_PPC_PLTREL24 out of range: -33554732 is not in [-33554432, 33554431]