[gtk-vnc] build-sys: build meson requirement to >=0.56

[Daniel P. Berrange <dberrange src gnome org>]

commit 061128e1400f1f76a00db1bb74e19bceaa9634ce
Author: Marc-André Lureau <marcandre lureau gmail com>
Date:   Tue Sep 6 16:49:32 2022 +0400

    build-sys: build meson requirement to >=0.56
    
    Modernize a little bit the meson file, to avoid extra warnings when
    running a recent meson versions.
    
    Signed-off-by: Marc-André Lureau <marcandre lureau redhat com>

 meson.build | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)
---
diff --git a/meson.build b/meson.build
index db34df3..925f241 100644
--- a/meson.build
+++ b/meson.build
@@ -7,7 +7,7 @@ project(
     'c_std=gnu99',
     'warning_level=2',
   ],
-  meson_version: '>= 0.49.0'
+  meson_version: '>= 0.56.0'
 )
 
 version_info = meson.project_version().split('.')
@@ -22,17 +22,17 @@ conf_data.set('version_minor', version_minor)
 conf_data.set('version_micro', version_micro)
 
 # ninja dist helper
-meson.add_dist_script('build-aux/dist.sh', meson.source_root(), meson.build_root())
+meson.add_dist_script('build-aux/dist.sh', meson.project_source_root(), meson.project_build_root())
 
 git = run_command('test', '-d', '.git', check: false).returncode() == 0
 
 if git
   test(
     'syntax-check',
-    find_program('@0@/build-aux/syntax-check'.format(meson.source_root())),
+    find_program('@0@/build-aux/syntax-check'.format(meson.project_source_root())),
     suite: 'style',
     env: [
-        'MESON_SOURCE_ROOT=@0@'.format(meson.source_root()),
+        'MESON_SOURCE_ROOT=@0@'.format(meson.project_source_root()),
     ],
   )
 endif
@@ -301,7 +301,7 @@ conf_data.set('localedir', gtk_vnc_localedir)
 
 gtk_vnc_pkgdatadir = join_paths(gtk_vnc_datadir, meson.project_name())
 
-po_dir = join_paths(meson.source_root(), 'po')
+po_dir = join_paths(meson.project_source_root(), 'po')
 
 conf_data.set('tls_priority', get_option('with-tls-priority'))
 
@@ -325,7 +325,7 @@ if not vala_opt.disabled()
       error('Vala API requires GObject introspection (-Dintrospection=true)')
     endif
   else
-    with_vala = add_languages('vala', required: vala_opt)
+    with_vala = add_languages('vala', required: vala_opt, native: false)
   endif
 endif