[pango/pango2] Use modern C++

[Matthias Clasen <matthiasc src gnome org>]

commit 2c1506797e6a429401722ba20a85a7b138d87da0
Author: Matthias Clasen <mclasen redhat com>
Date:   Sat Jun 18 15:21:05 2022 -0700

    Use modern C++
    
    This is needed to build HarfBuzz as a subproject.

 meson.build | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/meson.build b/meson.build
index 0ebdc346..92068d8c 100644
--- a/meson.build
+++ b/meson.build
@@ -7,6 +7,7 @@ project('pango', 'c', 'cpp',
           # We only need c99, but glib needs GNU-specific features
           # https://github.com/mesonbuild/meson/issues/2289
           'c_std=gnu99',
+          'cpp_std=c++11',
         ],
         meson_version : '>= 0.55.3')