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RISC-V KVM build error with Alpine Linux
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
3.
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)`.
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