[pango/missing-include] Add a missing include

[Matthias Clasen <matthiasc src gnome org>]

commit bcd14d2b8b55669b19fc1697caedffaebb0f58a4
Author: Matthias Clasen <mclasen redhat com>
Date:   Thu Dec 16 08:12:24 2021 -0500

    Add a missing include
    
    This was breaking the build on some macOs versions.
    
    Fixes: #640

 pango/json/gtkjsonparser.c | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/pango/json/gtkjsonparser.c b/pango/json/gtkjsonparser.c
index 10985bb2..0599d8f1 100644
--- a/pango/json/gtkjsonparser.c
+++ b/pango/json/gtkjsonparser.c
@@ -22,6 +22,7 @@
 
 #include "gtkjsonparserprivate.h"
 #include <stdlib.h>
+#include <errno.h>
 
 typedef struct _GtkJsonBlock GtkJsonBlock;