hw/pci: Restrict pci-bus stub to sysemu

Neither tools nor user-mode emulation require the PCI bus stub.

Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: David Hildenbrand <david@redhat.com>
Message-Id: <20220111184309.28637-4-f4bug@amsat.org>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>

stubs/meson.build

@@ -26,7 +26,6 @@ stub_ss.add(files('migr-blocker.c'))
 stub_ss.add(files('module-opts.c'))
 stub_ss.add(files('monitor.c'))
 stub_ss.add(files('monitor-core.c'))
-stub_ss.add(files('pci-bus.c'))
 stub_ss.add(files('qemu-timer-notify-cb.c'))
 stub_ss.add(files('qmp_memory_device.c'))
 stub_ss.add(files('qmp-command-available.c'))
@@ -51,6 +50,7 @@ if have_block
 endif
 if have_system
   stub_ss.add(files('fw_cfg.c'))
+  stub_ss.add(files('pci-bus.c'))
   stub_ss.add(files('semihost.c'))
   stub_ss.add(files('usb-dev-stub.c'))
   stub_ss.add(files('xen-hw-stub.c'))