Rollup merge of #53492 - danc86:lld-riscv, r=alexcrichton

update lld submodule to include RISCV patch

This pulls in one new commit, to add support for linking static RISCV
binaries, suitable for the new riscv32imac-unknown-none-elf target.
See: https://github.com/rust-lang/lld/pull/1

lld @ 813b3b95

-Subproject commit f76ea3ca16ed22dde8ef929db74a4b4df6f2f899
+Subproject commit 813b3b952c07b6b85732c3fbdf3eb74f61a9fa96