QEMU throws errors at the beginning of building
Description of problem:
QEMU throws errors at the beginning of building:
```
ninja: no work to do.
/tmp/qemu-8.1.5/build/pyvenv/bin/meson introspect --targets --tests --benchmarks | /tmp/qemu-8.1.5/build/pyvenv/bin/python3 -B scripts/mtest2make.py > Makefile.mtest
pc-bios/optionrom: -fcf-protection=none detected
pc-bios/optionrom: -fno-pie detected
pc-bios/optionrom: -no-pie detected
pc-bios/optionrom: -fno-stack-protector detected
pc-bios/optionrom: -Wno-array-bounds detected
pc-bios/optionrom: Assembling multiboot.o
pc-bios/optionrom: Assembling linuxboot.o
pc-bios/optionrom: Assembling multiboot_dma.o
pc-bios/optionrom: Compiling linuxboot_dma.o
pc-bios/optionrom: Assembling pvh.o
pc-bios/optionrom: Assembling kvmvapic.o
pc-bios/optionrom: Compiling pvh_main.o
pc-bios/optionrom: Linking multiboot.img
pc-bios/optionrom: Linking linuxboot.img
pc-bios/optionrom: Linking kvmvapic.img
pc-bios/optionrom: Extracting raw object multiboot.raw
/bin/sh: 1: -O: not found
make[1]: *** [Makefile:53: multiboot.raw] Error 127
make[1]: *** Waiting for unfinished jobs....
pc-bios/optionrom: Linking multiboot_dma.img
pc-bios/optionrom: Extracting raw object linuxboot.raw
/bin/sh: 1: -O: not found
make[1]: *** [Makefile:53: linuxboot.raw] Error 127
make: *** [Makefile:190: pc-bios/optionrom/all] Error 2
make: *** Waiting for unfinished jobs....
[1/10003] Generating trace/trace-hw_i2c.h with a custom command

...
```
Then proceeds the building. Whether it is failing at the end is not reliabily reproducible as it do fail one time and builds successfully at the next time. However, i don't know if these errors will cause runtime problems in the case of a successful build.
Steps to reproduce:
1. `../configure --enable-strip --audio-drv-list=alsa --enable-tools --enable-modules`
2. `make -j16`
Additional information:
Configuration log is available here: http://oscomp.hu/depot/qemu-8.1.5-configure.log