pbuild qemu dependency resolution

[bmwiedemann]

While working on my R-B-OS, I found that qemu fails to build in pbuild,
even though it works fine in OBS and osc build.

This is using
https://build.opensuse.org/project/show/home:bmwiedemann:reproducible:distribution:ring1

_build.standard.x86_64/qemu/_log shows

Compressed qemu-9.0.2.tar to qemu-9.0.2.tar.xz
syntax error in expression
spec file parser line 539: can't expand %(...)
syntax error in expression
syntax error in expression
syntax error in expression
syntax error in expression
syntax error in expression
-----------------------------------------------------------------
I have the following modifications for qemu.spec:
86c86
< Release:        0    
---
> Release:        1.1  
102c102
< BuildRequires:  glibc-devel-32bit
---
> BuildRequires:  glibc-devel-32bit glibc-32bit
1968c1968
< Release:        0    
---
> Release:        1.1  
1989c1989
< Release:        0    
---
> Release:        1.1  
2015c2015
< Release:        0    
---
> Release:        1.1  
-----------------------------------------------------------------
----- building qemu.spec (user abuild)
-----------------------------------------------------------------
-----------------------------------------------------------------
setting SOURCE_DATE_EPOCH_MTIME to 1721815255
+ exec rpmbuild -ba --define '_srcdefattr (-,root,root)' --nocheck --nosignature --define '_build_create_debug 1' /home/abuild/rpmbuild/SOURCES/qemu.spec
using SOURCE_DATE_EPOCH with value 1721815254 as build time
error: Failed build dependencies:
       canokey-qemu-devel is needed by qemu-9.0.2-1.1.x86_64
       libxdp-devel is needed by qemu-9.0.2-1.1.x86_64
       pkgconfig(spice-protocol) >= 0.12.3 is needed by qemu-9.0.2-1.1.x86_64
       pkgconfig(spice-server) >= 0.12.5 is needed by qemu-9.0.2-1.1.x86_64
       xen-devel >= 4.2 is needed by qemu-9.0.2-1.1.x86_64
### VM INTERACTION START ###
Powering off.^M
[   77.409037][ T3297] reboot: Power down
### VM INTERACTION END ###

The problem is that the required packages were not installed into the build-VM.

There seem to be different interpretations of

%if %{with_xen}
and
%if 0%{with spice}