[clutter/windows-fixes] meson.build: Force-include msvc_recommended_pragmas.h

[Chun-wei Fan <fanchunwei src gnome org>]

commit f98278c0b8658a53eafbadf1b7a9eacd266aee0c
Author: Chun-wei Fan <fanchunwei src gnome org>
Date:   Wed Oct 20 15:27:16 2021 +0800

    meson.build: Force-include msvc_recommended_pragmas.h
    
    ...on Visual Studio builds.  We can get rid of lots of compiler noise
    with that header, which we are free to use since we are always using
    GLib.
    
    Also, define _GNU_SOURCE when we are not using Visual Studio.

 meson.build | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)
---
diff --git a/meson.build b/meson.build
index e4051877a..4cb771aaa 100644
--- a/meson.build
+++ b/meson.build
@@ -28,7 +28,13 @@ clutter_libversion = '@0@.@1@.@2@'.format(clutter_so_age, clutter_binary_age, cl
 cc = meson.get_compiler('c')
 config_h = configuration_data()
 
-add_project_arguments([ '-D_GNU_SOURCE', '-DHAVE_CONFIG_H' ], language: 'c')
+add_project_arguments(['-DHAVE_CONFIG_H' ], language: 'c')
+
+if cc.get_id() == 'msvc'
+  add_project_arguments([ '-FImsvc_recommended_pragmas.h' ], language: 'c')
+else
+  add_project_arguments([ '-D_GNU_SOURCE' ], language: 'c')
+endif
 
 # Paths
 clutter_prefix = get_option('prefix')