[template-glib] build: bump warning_level=2

[Christian Hergert <chergert src gnome org>]

commit 4966b1e311478aabeb232d2184b56ecbb8f91eb1
Author: Christian Hergert <chergert redhat com>
Date:   Sat May 7 20:39:59 2022 -0700

    build: bump warning_level=2
    
    As mentioned in !8

 meson.build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/meson.build b/meson.build
index ca39a71..f332815 100644
--- a/meson.build
+++ b/meson.build
@@ -2,7 +2,7 @@ project('template-glib', 'c',
           version: '3.35.0',
           license: 'LGPLv2.1+',
     meson_version: '>= 0.51.0',
-  default_options: [ 'warning_level=1', 'buildtype=debugoptimized', 'c_std=gnu11' ],
+  default_options: [ 'warning_level=2', 'buildtype=debugoptimized', 'c_std=gnu11' ],
 )
 
 package_subdir = get_option('package_subdir')