[gparted] port-to-gtk3: Rework Gtk header includes (#7)

[Mike Fleetwood <mfleetwo src gnome org>]

commit 29a21a5a4c00c8023a2b7ac612d5d6bd2e9bc16e
Author: Luca Bacci <luca bacci982 gmail com>
Date:   Wed Aug 29 10:35:15 2018 +0200

    port-to-gtk3: Rework Gtk header includes (#7)
    
    In Gtk3 individual headers cannot be included directly in application
    code, only the header <gtk/gtk.h> can be included (with a few exceptions
    for some platform specific headers).
    
    This has always been considered good practice even for Gtk2, though was
    not a hard requirement.
    
    In Gtk3 this is enforced by preprocessor checks.  Failure to do so
    yields a preprocessor error and compilation fails:
    
      "error: Only <gtk/gtk.h> can be included directly."
    
    Change specific Gtk header includes to:
    
      #include <gtk/gtk.h>
    
    References:
    
    [1] Migrating from GTK+ 2.x to GTK+ 3 - "Do not include individual headers"
        https://developer.gnome.org/gtk3/stable/gtk-migrating-2-to-3.html#id-1.6.3.3.3
    
    [2] Commit - "Remove all traces of GDK_PIXBUF/GTK_DISABLE_SINGLE_INCLUDES"
        https://gitlab.gnome.org/GNOME/gtk/commit/5e29973773d4e2177f234675cc2a2b2016aa9fbc
    
    Closes #7 - Port to Gtk3

 src/DialogPasswordEntry.cc | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/src/DialogPasswordEntry.cc b/src/DialogPasswordEntry.cc
index 905472f3..cbf4d4fa 100644
--- a/src/DialogPasswordEntry.cc
+++ b/src/DialogPasswordEntry.cc
@@ -21,7 +21,8 @@
 #include <gtkmm/box.h>
 #include <gtkmm/stock.h>
 #include <gtkmm/button.h>
-#include <gtk/gtkentry.h>
+#include <gtk/gtk.h>
+
 
 namespace GParted
 {