RISC-V KVM build error with Alpine Linux

Host environment

• Operating system: Alpine linux edge

• OS/kernel version: Linux ncopa-edge-riscv64 6.1.40-0-lts #1-Alpine SMP PREEMPT_DYNAMIC Mon, 24 Jul 2023 08:57:36 +0000 riscv64 Linux

• Architecture: riscv64

• QEMU flavor: n/a

• QEMU version: 8.1.3

• QEMU command line: n/a

Emulated/Virtualized environment

• Operating system: n/a
• OS/kernel version: n/a
• Architecture: n/a

Description of problem

Native build of qemu fails on alpine linux riscv64.

Steps to reproduce

1. install alpine on riscv or set up a container with qemu-riscv64
2. build qemu 8.1.3 from source

Additional information

kvm.c:(.text+0xc50): undefined reference to `strerrorname_np'                                       
/usr/lib/gcc/riscv64-alpine-linux-musl/13.2.1/../../../../riscv64-alpine-linux-musl/bin/ld: libqemu-riscv64-softmmu.fa.p/target_riscv_kvm.c.o: in function `.L0 ':                                           
kvm.c:(.text+0xcda): undefined reference to `strerrorname_np'
/usr/lib/gcc/riscv64-alpine-linux-musl/13.2.1/../../../../riscv64-alpine-linux-musl/bin/ld: libqemu-riscv64-softmmu.fa.p/target_riscv_kvm.c.o: in function `.L111':                                          
kvm.c:(.text+0xd02): undefined reference to `strerrorname_np'  

The strerrorname_np is a GNU specific non-portable function (that what _np stands for). This is the only place where it is use in the entire qemu codebase:

$ rg strerrorname_np
target/riscv/kvm/kvm-cpu.c
837:                             strerrorname_np(errno));
899:                     strerrorname_np(errno));
909:                     strerrorname_np(errno));
932:                         strerrorname_np(errno));

Seems like other places uses strerror(errno).