[mutter] build: Add configuration summary line about coverage being enabled

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit c7f2ae1b169531a6ca90ec52c860646733ad692e
Author: Marco Trevisan (Treviño) <mail 3v1n0 net>
Date:   Wed May 6 15:35:41 2020 +0200

    build: Add configuration summary line about coverage being enabled
    
    https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1236

 meson.build | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/meson.build b/meson.build
index 8281556f4..691839bca 100644
--- a/meson.build
+++ b/meson.build
@@ -487,6 +487,7 @@ output = [
   '        Cogl tests............... ' + have_cogl_tests.to_string(),
   '        Clutter tests............ ' + have_clutter_tests.to_string(),
   '        Installed tests.......... ' + have_installed_tests.to_string(),
+  '        Coverage................. ' + get_option('b_coverage').to_string(),
   '',
   '  Now type \'ninja -C ' + meson.build_root() + '\' to build ' + meson.project_name(),
   '',