[at-spi2-core] build: Silence g-ir-scanner

[Emmanuele Bassi <ebassi src gnome org>]

commit 62d62192972d38df996dc6c6519bf07b21a812d7
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Thu May 17 15:21:58 2018 +0100

    build: Silence g-ir-scanner
    
    We don't need to see the whole g-ir-scanner incantation, only
    warnings and errors.

 atspi/meson.build |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/atspi/meson.build b/atspi/meson.build
index 17bfc45..1f8d021 100644
--- a/atspi/meson.build
+++ b/atspi/meson.build
@@ -90,7 +90,8 @@ if have_gir
 
   gir_extra_args = [
     '--c-include=atspi/atspi.h',
-    '--pkg-export=atspi-2'
+    '--pkg-export=atspi-2',
+    '--quiet',
   ]
 
   gir_dir = join_paths(atspi_datadir, 'gir-1.0')