Rollup merge of #129842 - no1wudi:master, r=saethlin

Fix LLVM ABI NAME for riscv64imac-unknown-nuttx-elf
This patch fix#129825
For the riscv64imac target, the LLVM ABI NAME should be "lp64", which is the default ABI if not specified for the riscv64imac target.

Author: matthiaskrgr

compiler/rustc_target/src/spec/targets/riscv64imac_unknown_nuttx_elf.rs

@@ -21,7 +21,6 @@ pub fn target() -> Target {
 os:"nuttx".into(),
 linker_flavor:LinkerFlavor::Gnu(Cc::No,Lld::Yes),
 linker:Some("rust-lld".into()),
-llvm_abiname:"lp64d".into(),
 cpu:"generic-rv64".into(),
 max_atomic_width:Some(64),
 features:"+m,+a,+c".into(),