[PATCH] build-sys: fix a meson deprecation warning

[marcandre . lureau]

From: Marc-André Lureau <marcandre.lur...@redhat.com>

WARNING: Deprecated features used:
 * 0.56.0: {'meson.source_root'}

Signed-off-by: Marc-André Lureau <marcandre.lur...@redhat.com>
Reported-by: Peter Maydell <peter.mayd...@linaro.org>
---
 tests/qtest/meson.build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tests/qtest/meson.build b/tests/qtest/meson.build
index 37e1eaa4498e..2f6687576757 100644
--- a/tests/qtest/meson.build
+++ b/tests/qtest/meson.build
@@ -103,7 +103,7 @@ if dbus_daemon.found() and 
config_host.has_key('GDBUS_CODEGEN')
   #qtests_i386 += ['dbus-vmstate-test']
   dbus_vmstate1 = custom_target('dbus-vmstate description',
                                 output: ['dbus-vmstate1.h', 'dbus-vmstate1.c'],
-                                input: meson.source_root() / 
'backends/dbus-vmstate1.xml',
+                                input: meson.project_source_root() / 
'backends/dbus-vmstate1.xml',
                                 command: [config_host['GDBUS_CODEGEN'],
                                           '@INPUT@',
                                           '--interface-prefix', 'org.qemu',
-- 
2.34.1.428.gdcc0cd074f0c