[dasher: 1/2] Remove extern "C" warpper around atspi/glib headers inclusion

[Patrick Welche <pwelche src gnome org>]

commit 5eed251f9bb0bae10e2efe177e1054346c7347d1
Author: Yanko Kaneti <yaneti declera com>
Date:   Thu Mar 25 16:37:44 2021 +0200

    Remove extern "C" warpper around atspi/glib headers inclusion
    
    Recently glib headers started using C++ features when compled in C++
    https://gitlab.gnome.org/GNOME/glib/-/merge_requests/1715/commits
    
    This leads to errors like:
    ..
    In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                     from /usr/include/glib-2.0/glib/gthread.h:32,
                     from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                     from /usr/include/glib-2.0/glib.h:32,
                     from /usr/include/at-spi-2.0/atspi/atspi.h:27,
                     from dasher_editor_external_atspi.cpp:5:
    /usr/include/c++/11/type_traits:56:3: error: template with C linkage
       56 |   template<typename _Tp, _Tp __v>
          |   ^~~~~~~~
    dasher_editor_external_atspi.cpp:4:1: note: 'extern "C"' linkage started here
        4 | extern "C" {
          | ^~~~~~~~~~
    ..
    
    Since for a while now glib headers are supposed to be safe to include in
    C++ code without extern "C" just remove it.

 Src/Gtk2/dasher_editor_external_atspi.cpp | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)
---
diff --git a/Src/Gtk2/dasher_editor_external_atspi.cpp b/Src/Gtk2/dasher_editor_external_atspi.cpp
index 76f637ace..6492c479f 100644
--- a/Src/Gtk2/dasher_editor_external_atspi.cpp
+++ b/Src/Gtk2/dasher_editor_external_atspi.cpp
@@ -1,9 +1,7 @@
 #include <X11/keysym.h>
 #include <string.h>
 
-extern "C" {
-  #include <atspi/atspi.h>
-}
+#include <atspi/atspi.h>
 
 #include "dasher_editor_external.h"
 #include "dasher_editor_private.h"