[PATCH v2] meson: fix condition for io_uring stubs

[Paolo Bonzini <pbonzini@redhat.com>]

CONFIG_LINUX_IO_URING is not included in config-host.mak and therefore is
not usable in "when" clauses.  Check the availability of the library,
which matches the condition for the non-stubbed version block/io_uring.c.

At this point, the difference between libraries that have config-host.mak
entries and those that do not is quite confusing.  The remaining ~dozen
should be converted in 6.2.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 stubs/meson.build | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/stubs/meson.build b/stubs/meson.build
index 2e79ff9f4d..d3fa8646b3 100644
--- a/stubs/meson.build
+++ b/stubs/meson.build
@@ -15,7 +15,9 @@ stub_ss.add(files('fdset.c'))
 stub_ss.add(files('fw_cfg.c'))
 stub_ss.add(files('gdbstub.c'))
 stub_ss.add(files('get-vm-name.c'))
-stub_ss.add(when: 'CONFIG_LINUX_IO_URING', if_true: files('io_uring.c'))
+if linux_io_uring.found()
+  stub_ss.add(files('io_uring.c'))
+endif
 stub_ss.add(files('iothread-lock.c'))
 stub_ss.add(files('isa-bus.c'))
 stub_ss.add(files('is-daemonized.c'))
-- 
2.31.1