Closed issue by pullmoll on void-packages repository

https://github.com/void-linux/void-packages/issues/24262

Description:
This happens in `do_install()`:
```
mkdir: cannot create directory ‘dtc/libfdt/libfdt.h’: File exists
make: *** [Makefile:538: dtc/libfdt/libfdt.h] Error 1
=> ERROR: qemu-5.0.0_2: do_install: 'make DESTDIR=${DESTDIR} install' exited with 2
=> ERROR:   in do_install() at srcpkgs/qemu/template:81
```

Line 538 of Makefile is:
```
        @mkdir -p $@
```
and it tries to create a directory with the name `dtc/libfdt/libfdt.h` here, not only `dtc/libfdt`.